From 14c51a5bd86384510071829ba0b0cfb515e924e5 Mon Sep 17 00:00:00 2001
From: Dan McGee <dan@archlinux.org>
Date: Wed, 29 Feb 2012 17:52:13 -0600
Subject: Update d3 to 2.8.1

Signed-off-by: Dan McGee <dan@archlinux.org>
---
 visualize/static/d3.geom.js       |  835 ----
 visualize/static/d3.geom.min.js   |    1 -
 visualize/static/d3.js            | 4707 -------------------
 visualize/static/d3.layout.js     | 1881 --------
 visualize/static/d3.layout.min.js |    1 -
 visualize/static/d3.min.js        |    2 -
 visualize/static/d3.v2.js         | 9342 +++++++++++++++++++++++++++++++++++++
 visualize/static/d3.v2.min.js     |    4 +
 8 files changed, 9346 insertions(+), 7427 deletions(-)
 delete mode 100644 visualize/static/d3.geom.js
 delete mode 100644 visualize/static/d3.geom.min.js
 delete mode 100644 visualize/static/d3.js
 delete mode 100644 visualize/static/d3.layout.js
 delete mode 100644 visualize/static/d3.layout.min.js
 delete mode 100644 visualize/static/d3.min.js
 create mode 100644 visualize/static/d3.v2.js
 create mode 100644 visualize/static/d3.v2.min.js

(limited to 'visualize')

diff --git a/visualize/static/d3.geom.js b/visualize/static/d3.geom.js
deleted file mode 100644
index d860c2bf..00000000
--- a/visualize/static/d3.geom.js
+++ /dev/null
@@ -1,835 +0,0 @@
-(function(){d3.geom = {};
-/**
- * Computes a contour for a given input grid function using the <a
- * href="http://en.wikipedia.org/wiki/Marching_squares">marching
- * squares</a> algorithm. Returns the contour polygon as an array of points.
- *
- * @param grid a two-input function(x, y) that returns true for values
- * inside the contour and false for values outside the contour.
- * @param start an optional starting point [x, y] on the grid.
- * @returns polygon [[x1, y1], [x2, y2], …]
- */
-d3.geom.contour = function(grid, start) {
-  var s = start || d3_geom_contourStart(grid), // starting point
-      c = [],    // contour polygon
-      x = s[0],  // current x position
-      y = s[1],  // current y position
-      dx = 0,    // next x direction
-      dy = 0,    // next y direction
-      pdx = NaN, // previous x direction
-      pdy = NaN, // previous y direction
-      i = 0;
-
-  do {
-    // determine marching squares index
-    i = 0;
-    if (grid(x-1, y-1)) i += 1;
-    if (grid(x,   y-1)) i += 2;
-    if (grid(x-1, y  )) i += 4;
-    if (grid(x,   y  )) i += 8;
-
-    // determine next direction
-    if (i === 6) {
-      dx = pdy === -1 ? -1 : 1;
-      dy = 0;
-    } else if (i === 9) {
-      dx = 0;
-      dy = pdx === 1 ? -1 : 1;
-    } else {
-      dx = d3_geom_contourDx[i];
-      dy = d3_geom_contourDy[i];
-    }
-
-    // update contour polygon
-    if (dx != pdx && dy != pdy) {
-      c.push([x, y]);
-      pdx = dx;
-      pdy = dy;
-    }
-
-    x += dx;
-    y += dy;
-  } while (s[0] != x || s[1] != y);
-
-  return c;
-};
-
-// lookup tables for marching directions
-var d3_geom_contourDx = [1, 0, 1, 1,-1, 0,-1, 1,0, 0,0,0,-1, 0,-1,NaN],
-    d3_geom_contourDy = [0,-1, 0, 0, 0,-1, 0, 0,1,-1,1,1, 0,-1, 0,NaN];
-
-function d3_geom_contourStart(grid) {
-  var x = 0,
-      y = 0;
-
-  // search for a starting point; begin at origin
-  // and proceed along outward-expanding diagonals
-  while (true) {
-    if (grid(x,y)) {
-      return [x,y];
-    }
-    if (x === 0) {
-      x = y + 1;
-      y = 0;
-    } else {
-      x = x - 1;
-      y = y + 1;
-    }
-  }
-}
-/**
- * Computes the 2D convex hull of a set of points using Graham's scanning
- * algorithm. The algorithm has been implemented as described in Cormen,
- * Leiserson, and Rivest's Introduction to Algorithms. The running time of
- * this algorithm is O(n log n), where n is the number of input points.
- *
- * @param vertices [[x1, y1], [x2, y2], …]
- * @returns polygon [[x1, y1], [x2, y2], …]
- */
-d3.geom.hull = function(vertices) {
-  if (vertices.length < 3) return [];
-
-  var len = vertices.length,
-      plen = len - 1,
-      points = [],
-      stack = [],
-      i, j, h = 0, x1, y1, x2, y2, u, v, a, sp;
-
-  // find the starting ref point: leftmost point with the minimum y coord
-  for (i=1; i<len; ++i) {
-    if (vertices[i][1] < vertices[h][1]) {
-      h = i;
-    } else if (vertices[i][1] == vertices[h][1]) {
-      h = (vertices[i][0] < vertices[h][0] ? i : h);
-    }
-  }
-
-  // calculate polar angles from ref point and sort
-  for (i=0; i<len; ++i) {
-    if (i === h) continue;
-    y1 = vertices[i][1] - vertices[h][1];
-    x1 = vertices[i][0] - vertices[h][0];
-    points.push({angle: Math.atan2(y1, x1), index: i});
-  }
-  points.sort(function(a, b) { return a.angle - b.angle; });
-
-  // toss out duplicate angles
-  a = points[0].angle;
-  v = points[0].index;
-  u = 0;
-  for (i=1; i<plen; ++i) {
-    j = points[i].index;
-    if (a == points[i].angle) {
-      // keep angle for point most distant from the reference
-      x1 = vertices[v][0] - vertices[h][0];
-      y1 = vertices[v][1] - vertices[h][1];
-      x2 = vertices[j][0] - vertices[h][0];
-      y2 = vertices[j][1] - vertices[h][1];
-      if ((x1*x1 + y1*y1) >= (x2*x2 + y2*y2)) {
-        points[i].index = -1;
-      } else {
-        points[u].index = -1;
-        a = points[i].angle;
-        u = i;
-        v = j;
-      }
-    } else {
-      a = points[i].angle;
-      u = i;
-      v = j;
-    }
-  }
-
-  // initialize the stack
-  stack.push(h);
-  for (i=0, j=0; i<2; ++j) {
-    if (points[j].index !== -1) {
-      stack.push(points[j].index);
-      i++;
-    }
-  }
-  sp = stack.length;
-
-  // do graham's scan
-  for (; j<plen; ++j) {
-    if (points[j].index === -1) continue; // skip tossed out points
-    while (!d3_geom_hullCCW(stack[sp-2], stack[sp-1], points[j].index, vertices)) {
-      --sp;
-    }
-    stack[sp++] = points[j].index;
-  }
-
-  // construct the hull
-  var poly = [];
-  for (i=0; i<sp; ++i) {
-    poly.push(vertices[stack[i]]);
-  }
-  return poly;
-}
-
-// are three points in counter-clockwise order?
-function d3_geom_hullCCW(i1, i2, i3, v) {
-  var t, a, b, c, d, e, f;
-  t = v[i1]; a = t[0]; b = t[1];
-  t = v[i2]; c = t[0]; d = t[1];
-  t = v[i3]; e = t[0]; f = t[1];
-  return ((f-b)*(c-a) - (d-b)*(e-a)) > 0;
-}
-// Note: requires coordinates to be counterclockwise and convex!
-d3.geom.polygon = function(coordinates) {
-
-  coordinates.area = function() {
-    var i = 0,
-        n = coordinates.length,
-        a = coordinates[n - 1][0] * coordinates[0][1],
-        b = coordinates[n - 1][1] * coordinates[0][0];
-    while (++i < n) {
-      a += coordinates[i - 1][0] * coordinates[i][1];
-      b += coordinates[i - 1][1] * coordinates[i][0];
-    }
-    return (b - a) * .5;
-  };
-
-  coordinates.centroid = function(k) {
-    var i = -1,
-        n = coordinates.length - 1,
-        x = 0,
-        y = 0,
-        a,
-        b,
-        c;
-    if (!arguments.length) k = -1 / (6 * coordinates.area());
-    while (++i < n) {
-      a = coordinates[i];
-      b = coordinates[i + 1];
-      c = a[0] * b[1] - b[0] * a[1];
-      x += (a[0] + b[0]) * c;
-      y += (a[1] + b[1]) * c;
-    }
-    return [x * k, y * k];
-  };
-
-  // The Sutherland-Hodgman clipping algorithm.
-  coordinates.clip = function(subject) {
-    var input,
-        i = -1,
-        n = coordinates.length,
-        j,
-        m,
-        a = coordinates[n - 1],
-        b,
-        c,
-        d;
-    while (++i < n) {
-      input = subject.slice();
-      subject.length = 0;
-      b = coordinates[i];
-      c = input[(m = input.length) - 1];
-      j = -1;
-      while (++j < m) {
-        d = input[j];
-        if (d3_geom_polygonInside(d, a, b)) {
-          if (!d3_geom_polygonInside(c, a, b)) {
-            subject.push(d3_geom_polygonIntersect(c, d, a, b));
-          }
-          subject.push(d);
-        } else if (d3_geom_polygonInside(c, a, b)) {
-          subject.push(d3_geom_polygonIntersect(c, d, a, b));
-        }
-        c = d;
-      }
-      a = b;
-    }
-    return subject;
-  };
-
-  return coordinates;
-};
-
-function d3_geom_polygonInside(p, a, b) {
-  return (b[0] - a[0]) * (p[1] - a[1]) < (b[1] - a[1]) * (p[0] - a[0]);
-}
-
-// Intersect two infinite lines cd and ab.
-function d3_geom_polygonIntersect(c, d, a, b) {
-  var x1 = c[0], x2 = d[0], x3 = a[0], x4 = b[0],
-      y1 = c[1], y2 = d[1], y3 = a[1], y4 = b[1],
-      x13 = x1 - x3,
-      x21 = x2 - x1,
-      x43 = x4 - x3,
-      y13 = y1 - y3,
-      y21 = y2 - y1,
-      y43 = y4 - y3,
-      ua = (x43 * y13 - y43 * x13) / (y43 * x21 - x43 * y21);
-  return [x1 + ua * x21, y1 + ua * y21];
-}
-// Adapted from Nicolas Garcia Belmonte's JIT implementation:
-// http://blog.thejit.org/2010/02/12/voronoi-tessellation/
-// http://blog.thejit.org/assets/voronoijs/voronoi.js
-// See lib/jit/LICENSE for details.
-
-// Notes:
-//
-// This implementation does not clip the returned polygons, so if you want to
-// clip them to a particular shape you will need to do that either in SVG or by
-// post-processing with d3.geom.polygon's clip method.
-//
-// If any vertices are coincident or have NaN positions, the behavior of this
-// method is undefined. Most likely invalid polygons will be returned. You
-// should filter invalid points, and consolidate coincident points, before
-// computing the tessellation.
-
-/**
- * @param vertices [[x1, y1], [x2, y2], …]
- * @returns polygons [[[x1, y1], [x2, y2], …], …]
- */
-d3.geom.voronoi = function(vertices) {
-  var polygons = vertices.map(function() { return []; });
-
-  d3_voronoi_tessellate(vertices, function(e) {
-    var s1,
-        s2,
-        x1,
-        x2,
-        y1,
-        y2;
-    if (e.a === 1 && e.b >= 0) {
-      s1 = e.ep.r;
-      s2 = e.ep.l;
-    } else {
-      s1 = e.ep.l;
-      s2 = e.ep.r;
-    }
-    if (e.a === 1) {
-      y1 = s1 ? s1.y : -1e6;
-      x1 = e.c - e.b * y1;
-      y2 = s2 ? s2.y : 1e6;
-      x2 = e.c - e.b * y2;
-    } else {
-      x1 = s1 ? s1.x : -1e6;
-      y1 = e.c - e.a * x1;
-      x2 = s2 ? s2.x : 1e6;
-      y2 = e.c - e.a * x2;
-    }
-    var v1 = [x1, y1],
-        v2 = [x2, y2];
-    polygons[e.region.l.index].push(v1, v2);
-    polygons[e.region.r.index].push(v1, v2);
-  });
-
-  // Reconnect the polygon segments into counterclockwise loops.
-  return polygons.map(function(polygon, i) {
-    var cx = vertices[i][0],
-        cy = vertices[i][1];
-    polygon.forEach(function(v) {
-      v.angle = Math.atan2(v[0] - cx, v[1] - cy);
-    });
-    return polygon.sort(function(a, b) {
-      return a.angle - b.angle;
-    }).filter(function(d, i) {
-      return !i || (d.angle - polygon[i - 1].angle > 1e-10);
-    });
-  });
-};
-
-var d3_voronoi_opposite = {"l": "r", "r": "l"};
-
-function d3_voronoi_tessellate(vertices, callback) {
-
-  var Sites = {
-    list: vertices
-      .map(function(v, i) {
-        return {
-          index: i,
-          x: v[0],
-          y: v[1]
-        };
-      })
-      .sort(function(a, b) {
-        return a.y < b.y ? -1
-          : a.y > b.y ? 1
-          : a.x < b.x ? -1
-          : a.x > b.x ? 1
-          : 0;
-      }),
-    bottomSite: null
-  };
-
-  var EdgeList = {
-    list: [],
-    leftEnd: null,
-    rightEnd: null,
-
-    init: function() {
-      EdgeList.leftEnd = EdgeList.createHalfEdge(null, "l");
-      EdgeList.rightEnd = EdgeList.createHalfEdge(null, "l");
-      EdgeList.leftEnd.r = EdgeList.rightEnd;
-      EdgeList.rightEnd.l = EdgeList.leftEnd;
-      EdgeList.list.unshift(EdgeList.leftEnd, EdgeList.rightEnd);
-    },
-
-    createHalfEdge: function(edge, side) {
-      return {
-        edge: edge,
-        side: side,
-        vertex: null,
-        "l": null,
-        "r": null
-      };
-    },
-
-    insert: function(lb, he) {
-      he.l = lb;
-      he.r = lb.r;
-      lb.r.l = he;
-      lb.r = he;
-    },
-
-    leftBound: function(p) {
-      var he = EdgeList.leftEnd;
-      do {
-        he = he.r;
-      } while (he != EdgeList.rightEnd && Geom.rightOf(he, p));
-      he = he.l;
-      return he;
-    },
-
-    del: function(he) {
-      he.l.r = he.r;
-      he.r.l = he.l;
-      he.edge = null;
-    },
-
-    right: function(he) {
-      return he.r;
-    },
-
-    left: function(he) {
-      return he.l;
-    },
-
-    leftRegion: function(he) {
-      return he.edge == null
-          ? Sites.bottomSite
-          : he.edge.region[he.side];
-    },
-
-    rightRegion: function(he) {
-      return he.edge == null
-          ? Sites.bottomSite
-          : he.edge.region[d3_voronoi_opposite[he.side]];
-    }
-  };
-
-  var Geom = {
-
-    bisect: function(s1, s2) {
-      var newEdge = {
-        region: {"l": s1, "r": s2},
-        ep: {"l": null, "r": null}
-      };
-
-      var dx = s2.x - s1.x,
-          dy = s2.y - s1.y,
-          adx = dx > 0 ? dx : -dx,
-          ady = dy > 0 ? dy : -dy;
-
-      newEdge.c = s1.x * dx + s1.y * dy
-          + (dx * dx + dy * dy) * .5;
-
-      if (adx > ady) {
-        newEdge.a = 1;
-        newEdge.b = dy / dx;
-        newEdge.c /= dx;
-      } else {
-        newEdge.b = 1;
-        newEdge.a = dx / dy;
-        newEdge.c /= dy;
-      }
-
-      return newEdge;
-    },
-
-    intersect: function(el1, el2) {
-      var e1 = el1.edge,
-          e2 = el2.edge;
-      if (!e1 || !e2 || (e1.region.r == e2.region.r)) {
-        return null;
-      }
-      var d = (e1.a * e2.b) - (e1.b * e2.a);
-      if (Math.abs(d) < 1e-10) {
-        return null;
-      }
-      var xint = (e1.c * e2.b - e2.c * e1.b) / d,
-          yint = (e2.c * e1.a - e1.c * e2.a) / d,
-          e1r = e1.region.r,
-          e2r = e2.region.r,
-          el,
-          e;
-      if ((e1r.y < e2r.y) ||
-         (e1r.y == e2r.y && e1r.x < e2r.x)) {
-        el = el1;
-        e = e1;
-      } else {
-        el = el2;
-        e = e2;
-      }
-      var rightOfSite = (xint >= e.region.r.x);
-      if ((rightOfSite && (el.side === "l")) ||
-        (!rightOfSite && (el.side === "r"))) {
-        return null;
-      }
-      return {
-        x: xint,
-        y: yint
-      };
-    },
-
-    rightOf: function(he, p) {
-      var e = he.edge,
-          topsite = e.region.r,
-          rightOfSite = (p.x > topsite.x);
-
-      if (rightOfSite && (he.side === "l")) {
-        return 1;
-      }
-      if (!rightOfSite && (he.side === "r")) {
-        return 0;
-      }
-      if (e.a === 1) {
-        var dyp = p.y - topsite.y,
-            dxp = p.x - topsite.x,
-            fast = 0,
-            above = 0;
-
-        if ((!rightOfSite && (e.b < 0)) ||
-          (rightOfSite && (e.b >= 0))) {
-          above = fast = (dyp >= e.b * dxp);
-        } else {
-          above = ((p.x + p.y * e.b) > e.c);
-          if (e.b < 0) {
-            above = !above;
-          }
-          if (!above) {
-            fast = 1;
-          }
-        }
-        if (!fast) {
-          var dxs = topsite.x - e.region.l.x;
-          above = (e.b * (dxp * dxp - dyp * dyp)) <
-            (dxs * dyp * (1 + 2 * dxp / dxs + e.b * e.b));
-
-          if (e.b < 0) {
-            above = !above;
-          }
-        }
-      } else /* e.b == 1 */ {
-        var yl = e.c - e.a * p.x,
-            t1 = p.y - yl,
-            t2 = p.x - topsite.x,
-            t3 = yl - topsite.y;
-
-        above = (t1 * t1) > (t2 * t2 + t3 * t3);
-      }
-      return he.side === "l" ? above : !above;
-    },
-
-    endPoint: function(edge, side, site) {
-      edge.ep[side] = site;
-      if (!edge.ep[d3_voronoi_opposite[side]]) return;
-      callback(edge);
-    },
-
-    distance: function(s, t) {
-      var dx = s.x - t.x,
-          dy = s.y - t.y;
-      return Math.sqrt(dx * dx + dy * dy);
-    }
-  };
-
-  var EventQueue = {
-    list: [],
-
-    insert: function(he, site, offset) {
-      he.vertex = site;
-      he.ystar = site.y + offset;
-      for (var i=0, list=EventQueue.list, l=list.length; i<l; i++) {
-        var next = list[i];
-        if (he.ystar > next.ystar ||
-          (he.ystar == next.ystar &&
-          site.x > next.vertex.x)) {
-          continue;
-        } else {
-          break;
-        }
-      }
-      list.splice(i, 0, he);
-    },
-
-    del: function(he) {
-      for (var i=0, ls=EventQueue.list, l=ls.length; i<l && (ls[i] != he); ++i) {}
-      ls.splice(i, 1);
-    },
-
-    empty: function() { return EventQueue.list.length === 0; },
-
-    nextEvent: function(he) {
-      for (var i=0, ls=EventQueue.list, l=ls.length; i<l; ++i) {
-        if (ls[i] == he) return ls[i+1];
-      }
-      return null;
-    },
-
-    min: function() {
-      var elem = EventQueue.list[0];
-      return {
-        x: elem.vertex.x,
-        y: elem.ystar
-      };
-    },
-
-    extractMin: function() {
-      return EventQueue.list.shift();
-    }
-  };
-
-  EdgeList.init();
-  Sites.bottomSite = Sites.list.shift();
-
-  var newSite = Sites.list.shift(), newIntStar;
-  var lbnd, rbnd, llbnd, rrbnd, bisector;
-  var bot, top, temp, p, v;
-  var e, pm;
-
-  while (true) {
-    if (!EventQueue.empty()) {
-      newIntStar = EventQueue.min();
-    }
-    if (newSite && (EventQueue.empty()
-      || newSite.y < newIntStar.y
-      || (newSite.y == newIntStar.y
-      && newSite.x < newIntStar.x))) { //new site is smallest
-      lbnd = EdgeList.leftBound(newSite);
-      rbnd = EdgeList.right(lbnd);
-      bot = EdgeList.rightRegion(lbnd);
-      e = Geom.bisect(bot, newSite);
-      bisector = EdgeList.createHalfEdge(e, "l");
-      EdgeList.insert(lbnd, bisector);
-      p = Geom.intersect(lbnd, bisector);
-      if (p) {
-        EventQueue.del(lbnd);
-        EventQueue.insert(lbnd, p, Geom.distance(p, newSite));
-      }
-      lbnd = bisector;
-      bisector = EdgeList.createHalfEdge(e, "r");
-      EdgeList.insert(lbnd, bisector);
-      p = Geom.intersect(bisector, rbnd);
-      if (p) {
-        EventQueue.insert(bisector, p, Geom.distance(p, newSite));
-      }
-      newSite = Sites.list.shift();
-    } else if (!EventQueue.empty()) { //intersection is smallest
-      lbnd = EventQueue.extractMin();
-      llbnd = EdgeList.left(lbnd);
-      rbnd = EdgeList.right(lbnd);
-      rrbnd = EdgeList.right(rbnd);
-      bot = EdgeList.leftRegion(lbnd);
-      top = EdgeList.rightRegion(rbnd);
-      v = lbnd.vertex;
-      Geom.endPoint(lbnd.edge, lbnd.side, v);
-      Geom.endPoint(rbnd.edge, rbnd.side, v);
-      EdgeList.del(lbnd);
-      EventQueue.del(rbnd);
-      EdgeList.del(rbnd);
-      pm = "l";
-      if (bot.y > top.y) {
-        temp = bot;
-        bot = top;
-        top = temp;
-        pm = "r";
-      }
-      e = Geom.bisect(bot, top);
-      bisector = EdgeList.createHalfEdge(e, pm);
-      EdgeList.insert(llbnd, bisector);
-      Geom.endPoint(e, d3_voronoi_opposite[pm], v);
-      p = Geom.intersect(llbnd, bisector);
-      if (p) {
-        EventQueue.del(llbnd);
-        EventQueue.insert(llbnd, p, Geom.distance(p, bot));
-      }
-      p = Geom.intersect(bisector, rrbnd);
-      if (p) {
-        EventQueue.insert(bisector, p, Geom.distance(p, bot));
-      }
-    } else {
-      break;
-    }
-  }//end while
-
-  for (lbnd = EdgeList.right(EdgeList.leftEnd);
-      lbnd != EdgeList.rightEnd;
-      lbnd = EdgeList.right(lbnd)) {
-    callback(lbnd.edge);
-  }
-}
-/**
-* @param vertices [[x1, y1], [x2, y2], …]
-* @returns triangles [[[x1, y1], [x2, y2], [x3, y3]], …]
- */
-d3.geom.delaunay = function(vertices) {
-  var edges = vertices.map(function() { return []; }),
-      triangles = [];
-
-  // Use the Voronoi tessellation to determine Delaunay edges.
-  d3_voronoi_tessellate(vertices, function(e) {
-    edges[e.region.l.index].push(vertices[e.region.r.index]);
-  });
-
-  // Reconnect the edges into counterclockwise triangles.
-  edges.forEach(function(edge, i) {
-    var v = vertices[i],
-        cx = v[0],
-        cy = v[1];
-    edge.forEach(function(v) {
-      v.angle = Math.atan2(v[0] - cx, v[1] - cy);
-    });
-    edge.sort(function(a, b) {
-      return a.angle - b.angle;
-    });
-    for (var j = 0, m = edge.length - 1; j < m; j++) {
-      triangles.push([v, edge[j], edge[j + 1]]);
-    }
-  });
-
-  return triangles;
-};
-// Constructs a new quadtree for the specified array of points. A quadtree is a
-// two-dimensional recursive spatial subdivision. This implementation uses
-// square partitions, dividing each square into four equally-sized squares. Each
-// point exists in a unique node; if multiple points are in the same position,
-// some points may be stored on internal nodes rather than leaf nodes. Quadtrees
-// can be used to accelerate various spatial operations, such as the Barnes-Hut
-// approximation for computing n-body forces, or collision detection.
-d3.geom.quadtree = function(points, x1, y1, x2, y2) {
-  var p,
-      i = -1,
-      n = points.length;
-
-  // Type conversion for deprecated API.
-  if (n && isNaN(points[0].x)) points = points.map(d3_geom_quadtreePoint);
-
-  // Allow bounds to be specified explicitly.
-  if (arguments.length < 5) {
-    if (arguments.length === 3) {
-      y2 = x2 = y1;
-      y1 = x1;
-    } else {
-      x1 = y1 = Infinity;
-      x2 = y2 = -Infinity;
-
-      // Compute bounds.
-      while (++i < n) {
-        p = points[i];
-        if (p.x < x1) x1 = p.x;
-        if (p.y < y1) y1 = p.y;
-        if (p.x > x2) x2 = p.x;
-        if (p.y > y2) y2 = p.y;
-      }
-
-      // Squarify the bounds.
-      var dx = x2 - x1,
-          dy = y2 - y1;
-      if (dx > dy) y2 = y1 + dx;
-      else x2 = x1 + dy;
-    }
-  }
-
-  // Recursively inserts the specified point p at the node n or one of its
-  // descendants. The bounds are defined by [x1, x2] and [y1, y2].
-  function insert(n, p, x1, y1, x2, y2) {
-    if (isNaN(p.x) || isNaN(p.y)) return; // ignore invalid points
-    if (n.leaf) {
-      var v = n.point;
-      if (v) {
-        // If the point at this leaf node is at the same position as the new
-        // point we are adding, we leave the point associated with the
-        // internal node while adding the new point to a child node. This
-        // avoids infinite recursion.
-        if ((Math.abs(v.x - p.x) + Math.abs(v.y - p.y)) < .01) {
-          insertChild(n, p, x1, y1, x2, y2);
-        } else {
-          n.point = null;
-          insertChild(n, v, x1, y1, x2, y2);
-          insertChild(n, p, x1, y1, x2, y2);
-        }
-      } else {
-        n.point = p;
-      }
-    } else {
-      insertChild(n, p, x1, y1, x2, y2);
-    }
-  }
-
-  // Recursively inserts the specified point p into a descendant of node n. The
-  // bounds are defined by [x1, x2] and [y1, y2].
-  function insertChild(n, p, x1, y1, x2, y2) {
-    // Compute the split point, and the quadrant in which to insert p.
-    var sx = (x1 + x2) * .5,
-        sy = (y1 + y2) * .5,
-        right = p.x >= sx,
-        bottom = p.y >= sy,
-        i = (bottom << 1) + right;
-
-    // Recursively insert into the child node.
-    n.leaf = false;
-    n = n.nodes[i] || (n.nodes[i] = d3_geom_quadtreeNode());
-
-    // Update the bounds as we recurse.
-    if (right) x1 = sx; else x2 = sx;
-    if (bottom) y1 = sy; else y2 = sy;
-    insert(n, p, x1, y1, x2, y2);
-  }
-
-  // Create the root node.
-  var root = d3_geom_quadtreeNode();
-
-  root.add = function(p) {
-    insert(root, p, x1, y1, x2, y2);
-  };
-
-  root.visit = function(f) {
-    d3_geom_quadtreeVisit(f, root, x1, y1, x2, y2);
-  };
-
-  // Insert all points.
-  points.forEach(root.add);
-  return root;
-};
-
-function d3_geom_quadtreeNode() {
-  return {
-    leaf: true,
-    nodes: [],
-    point: null
-  };
-}
-
-function d3_geom_quadtreeVisit(f, node, x1, y1, x2, y2) {
-  if (!f(node, x1, y1, x2, y2)) {
-    var sx = (x1 + x2) * .5,
-        sy = (y1 + y2) * .5,
-        children = node.nodes;
-    if (children[0]) d3_geom_quadtreeVisit(f, children[0], x1, y1, sx, sy);
-    if (children[1]) d3_geom_quadtreeVisit(f, children[1], sx, y1, x2, sy);
-    if (children[2]) d3_geom_quadtreeVisit(f, children[2], x1, sy, sx, y2);
-    if (children[3]) d3_geom_quadtreeVisit(f, children[3], sx, sy, x2, y2);
-  }
-}
-
-function d3_geom_quadtreePoint(p) {
-  return {
-    x: p[0],
-    y: p[1]
-  };
-}
-})();
diff --git a/visualize/static/d3.geom.min.js b/visualize/static/d3.geom.min.js
deleted file mode 100644
index 2dc6395d..00000000
--- a/visualize/static/d3.geom.min.js
+++ /dev/null
@@ -1 +0,0 @@
-(function(){function c(a){var b=0,c=0;for(;;){if(a(b,c))return[b,c];b===0?(b=c+1,c=0):(b-=1,c+=1)}}function d(a,b,c,d){var e,f,g,h,i,j,k;return e=d[a],f=e[0],g=e[1],e=d[b],h=e[0],i=e[1],e=d[c],j=e[0],k=e[1],(k-g)*(h-f)-(i-g)*(j-f)>0}function e(a,b,c){return(c[0]-b[0])*(a[1]-b[1])<(c[1]-b[1])*(a[0]-b[0])}function f(a,b,c,d){var e=a[0],f=b[0],g=c[0],h=d[0],i=a[1],j=b[1],k=c[1],l=d[1],m=e-g,n=f-e,o=h-g,p=i-k,q=j-i,r=l-k,s=(o*p-r*m)/(r*n-o*q);return[e+s*n,i+s*q]}function h(a,b){var c={list:a.map(function(a,b){return{index:b,x:a[0],y:a[1]}}).sort(function(a,b){return a.y<b.y?-1:a.y>b.y?1:a.x<b.x?-1:a.x>b.x?1:0}),bottomSite:null},d={list:[],leftEnd:null,rightEnd:null,init:function(){d.leftEnd=d.createHalfEdge(null,"l"),d.rightEnd=d.createHalfEdge(null,"l"),d.leftEnd.r=d.rightEnd,d.rightEnd.l=d.leftEnd,d.list.unshift(d.leftEnd,d.rightEnd)},createHalfEdge:function(a,b){return{edge:a,side:b,vertex:null,l:null,r:null}},insert:function(a,b){b.l=a,b.r=a.r,a.r.l=b,a.r=b},leftBound:function(a){var b=d.leftEnd;do b=b.r;while(b!=d.rightEnd&&e.rightOf(b,a));return b=b.l,b},del:function(a){a.l.r=a.r,a.r.l=a.l,a.edge=null},right:function(a){return a.r},left:function(a){return a.l},leftRegion:function(a){return a.edge==null?c.bottomSite:a.edge.region[a.side]},rightRegion:function(a){return a.edge==null?c.bottomSite:a.edge.region[g[a.side]]}},e={bisect:function(a,b){var c={region:{l:a,r:b},ep:{l:null,r:null}},d=b.x-a.x,e=b.y-a.y,f=d>0?d:-d,g=e>0?e:-e;return c.c=a.x*d+a.y*e+(d*d+e*e)*.5,f>g?(c.a=1,c.b=e/d,c.c/=d):(c.b=1,c.a=d/e,c.c/=e),c},intersect:function(a,b){var c=a.edge,d=b.edge;if(!c||!d||c.region.r==d.region.r)return null;var e=c.a*d.b-c.b*d.a;if(Math.abs(e)<1e-10)return null;var f=(c.c*d.b-d.c*c.b)/e,g=(d.c*c.a-c.c*d.a)/e,h=c.region.r,i=d.region.r,j,k;h.y<i.y||h.y==i.y&&h.x<i.x?(j=a,k=c):(j=b,k=d);var l=f>=k.region.r.x;return l&&j.side==="l"||!l&&j.side==="r"?null:{x:f,y:g}},rightOf:function(a,b){var c=a.edge,d=c.region.r,e=b.x>d.x;if(e&&a.side==="l")return 1;if(!e&&a.side==="r")return 0;if(c.a===1){var f=b.y-d.y,g=b.x-d.x,h=0,i=0;!e&&c.b<0||e&&c.b>=0?i=h=f>=c.b*g:(i=b.x+b.y*c.b>c.c,c.b<0&&(i=!i),i||(h=1));if(!h){var j=d.x-c.region.l.x;i=c.b*(g*g-f*f)<j*f*(1+2*g/j+c.b*c.b),c.b<0&&(i=!i)}}else{var k=c.c-c.a*b.x,l=b.y-k,m=b.x-d.x,n=k-d.y;i=l*l>m*m+n*n}return a.side==="l"?i:!i},endPoint:function(a,c,d){a.ep[c]=d;if(!a.ep[g[c]])return;b(a)},distance:function(a,b){var c=a.x-b.x,d=a.y-b.y;return Math.sqrt(c*c+d*d)}},f={list:[],insert:function(a,b,c){a.vertex=b,a.ystar=b.y+c;for(var d=0,e=f.list,g=e.length;d<g;d++){var h=e[d];if(a.ystar>h.ystar||a.ystar==h.ystar&&b.x>h.vertex.x)continue;break}e.splice(d,0,a)},del:function(a){for(var b=0,c=f.list,d=c.length;b<d&&c[b]!=a;++b);c.splice(b,1)},empty:function(){return f.list.length===0},nextEvent:function(a){for(var b=0,c=f.list,d=c.length;b<d;++b)if(c[b]==a)return c[b+1];return null},min:function(){var a=f.list[0];return{x:a.vertex.x,y:a.ystar}},extractMin:function(){return f.list.shift()}};d.init(),c.bottomSite=c.list.shift();var h=c.list.shift(),i,j,k,l,m,n,o,p,q,r,s,t,u;for(;;){f.empty()||(i=f.min());if(h&&(f.empty()||h.y<i.y||h.y==i.y&&h.x<i.x))j=d.leftBound(h),k=d.right(j),o=d.rightRegion(j),t=e.bisect(o,h),n=d.createHalfEdge(t,"l"),d.insert(j,n),r=e.intersect(j,n),r&&(f.del(j),f.insert(j,r,e.distance(r,h))),j=n,n=d.createHalfEdge(t,"r"),d.insert(j,n),r=e.intersect(n,k),r&&f.insert(n,r,e.distance(r,h)),h=c.list.shift();else if(!f.empty())j=f.extractMin(),l=d.left(j),k=d.right(j),m=d.right(k),o=d.leftRegion(j),p=d.rightRegion(k),s=j.vertex,e.endPoint(j.edge,j.side,s),e.endPoint(k.edge,k.side,s),d.del(j),f.del(k),d.del(k),u="l",o.y>p.y&&(q=o,o=p,p=q,u="r"),t=e.bisect(o,p),n=d.createHalfEdge(t,u),d.insert(l,n),e.endPoint(t,g[u],s),r=e.intersect(l,n),r&&(f.del(l),f.insert(l,r,e.distance(r,o))),r=e.intersect(n,m),r&&f.insert(n,r,e.distance(r,o));else break}for(j=d.right(d.leftEnd);j!=d.rightEnd;j=d.right(j))b(j.edge)}function i(){return{leaf:!0,nodes:[],point:null}}function j(a,b,c,d,e,f){if(!a(b,c,d,e,f)){var g=(c+e)*.5,h=(d+f)*.5,i=b.nodes;i[0]&&j(a,i[0],c,d,g,h),i[1]&&j(a,i[1],g,d,e,h),i[2]&&j(a,i[2],c,h,g,f),i[3]&&j(a,i[3],g,h,e,f)}}function k(a){return{x:a[0],y:a[1]}}d3.geom={},d3.geom.contour=function(d,e){var f=e||c(d),g=[],h=f[0],i=f[1],j=0,k=0,l=NaN,m=NaN,n=0;do n=0,d(h-1,i-1)&&(n+=1),d(h,i-1)&&(n+=2),d(h-1,i)&&(n+=4),d(h,i)&&(n+=8),n===6?(j=m===-1?-1:1,k=0):n===9?(j=0,k=l===1?-1:1):(j=a[n],k=b[n]),j!=l&&k!=m&&(g.push([h,i]),l=j,m=k),h+=j,i+=k;while(f[0]!=h||f[1]!=i);return g};var a=[1,0,1,1,-1,0,-1,1,0,0,0,0,-1,0,-1,NaN],b=[0,-1,0,0,0,-1,0,0,1,-1,1,1,0,-1,0,NaN];d3.geom.hull=function(a){if(a.length<3)return[];var b=a.length,c=b-1,e=[],f=[],g,h,i=0,j,k,l,m,n,o,p,q;for(g=1;g<b;++g)a[g][1]<a[i][1]?i=g:a[g][1]==a[i][1]&&(i=a[g][0]<a[i][0]?g:i);for(g=0;g<b;++g){if(g===i)continue;k=a[g][1]-a[i][1],j=a[g][0]-a[i][0],e.push({angle:Math.atan2(k,j),index:g})}e.sort(function(a,b){return a.angle-b.angle}),p=e[0].angle,o=e[0].index,n=0;for(g=1;g<c;++g)h=e[g].index,p==e[g].angle?(j=a[o][0]-a[i][0],k=a[o][1]-a[i][1],l=a[h][0]-a[i][0],m=a[h][1]-a[i][1],j*j+k*k>=l*l+m*m?e[g].index=-1:(e[n].index=-1,p=e[g].angle,n=g,o=h)):(p=e[g].angle,n=g,o=h);f.push(i);for(g=0,h=0;g<2;++h)e[h].index!==-1&&(f.push(e[h].index),g++);q=f.length;for(;h<c;++h){if(e[h].index===-1)continue;while(!d(f[q-2],f[q-1],e[h].index,a))--q;f[q++]=e[h].index}var r=[];for(g=0;g<q;++g)r.push(a[f[g]]);return r},d3.geom.polygon=function(a){return a.area=function(){var b=0,c=a.length,d=a[c-1][0]*a[0][1],e=a[c-1][1]*a[0][0];while(++b<c)d+=a[b-1][0]*a[b][1],e+=a[b-1][1]*a[b][0];return(e-d)*.5},a.centroid=function(b){var c=-1,d=a.length-1,e=0,f=0,g,h,i;arguments.length||(b=-1/(6*a.area()));while(++c<d)g=a[c],h=a[c+1],i=g[0]*h[1]-h[0]*g[1],e+=(g[0]+h[0])*i,f+=(g[1]+h[1])*i;return[e*b,f*b]},a.clip=function(b){var c,d=-1,g=a.length,h,i,j=a[g-1],k,l,m;while(++d<g){c=b.slice(),b.length=0,k=a[d],l=c[(i=c.length)-1],h=-1;while(++h<i)m=c[h],e(m,j,k)?(e(l,j,k)||b.push(f(l,m,j,k)),b.push(m)):e(l,j,k)&&b.push(f(l,m,j,k)),l=m;j=k}return b},a},d3.geom.voronoi=function(a){var b=a.map(function(){return[]});return h(a,function(a){var c,d,e,f,g,h;a.a===1&&a.b>=0?(c=a.ep.r,d=a.ep.l):(c=a.ep.l,d=a.ep.r),a.a===1?(g=c?c.y:-1e6,e=a.c-a.b*g,h=d?d.y:1e6,f=a.c-a.b*h):(e=c?c.x:-1e6,g=a.c-a.a*e,f=d?d.x:1e6,h=a.c-a.a*f);var i=[e,g],j=[f,h];b[a.region.l.index].push(i,j),b[a.region.r.index].push(i,j)}),b.map(function(b,c){var d=a[c][0],e=a[c][1];return b.forEach(function(a){a.angle=Math.atan2(a[0]-d,a[1]-e)}),b.sort(function(a,b){return a.angle-b.angle}).filter(function(a,c){return!c||a.angle-b[c-1].angle>1e-10})})};var g={l:"r",r:"l"};d3.geom.delaunay=function(a){var b=a.map(function(){return[]}),c=[];return h(a,function(c){b[c.region.l.index].push(a[c.region.r.index])}),b.forEach(function(b,d){var e=a[d],f=e[0],g=e[1];b.forEach(function(a){a.angle=Math.atan2(a[0]-f,a[1]-g)}),b.sort(function(a,b){return a.angle-b.angle});for(var h=0,i=b.length-1;h<i;h++)c.push([e,b[h],b[h+1]])}),c},d3.geom.quadtree=function(a,b,c,d,e){function n(a,b,c,d,e,f){if(isNaN(b.x)||isNaN(b.y))return;if(a.leaf){var g=a.point;g?Math.abs(g.x-b.x)+Math.abs(g.y-b.y)<.01?o(a,b,c,d,e,f):(a.point=null,o(a,g,c,d,e,f),o(a,b,c,d,e,f)):a.point=b}else o(a,b,c,d,e,f)}function o(a,b,c,d,e,f){var g=(c+e)*.5,h=(d+f)*.5,j=b.x>=g,k=b.y>=h,l=(k<<1)+j;a.leaf=!1,a=a.nodes[l]||(a.nodes[l]=i()),j?c=g:e=g,k?d=h:f=h,n(a,b,c,d,e,f)}var f,g=-1,h=a.length;h&&isNaN(a[0].x)&&(a=a.map(k));if(arguments.length<5)if(arguments.length===3)e=d=c,c=b;else{b=c=Infinity,d=e=-Infinity;while(++g<h)f=a[g],f.x<b&&(b=f.x),f.y<c&&(c=f.y),f.x>d&&(d=f.x),f.y>e&&(e=f.y);var l=d-b,m=e-c;l>m?e=c+l:d=b+m}var p=i();return p.add=function(a){n(p,a,b,c,d,e)},p.visit=function(a){j(a,p,b,c,d,e)},a.forEach(p.add),p}})();
\ No newline at end of file
diff --git a/visualize/static/d3.js b/visualize/static/d3.js
deleted file mode 100644
index 9042897e..00000000
--- a/visualize/static/d3.js
+++ /dev/null
@@ -1,4707 +0,0 @@
-(function(){if (!Date.now) Date.now = function() {
-  return +new Date;
-};
-try {
-  document.createElement("div").style.setProperty("opacity", 0, "");
-} catch (error) {
-  var d3_style_prototype = CSSStyleDeclaration.prototype,
-      d3_style_setProperty = d3_style_prototype.setProperty;
-  d3_style_prototype.setProperty = function(name, value, priority) {
-    d3_style_setProperty.call(this, name, value + "", priority);
-  };
-}
-d3 = {version: "2.7.2"}; // semver
-var d3_array = d3_arraySlice; // conversion for NodeLists
-
-function d3_arrayCopy(pseudoarray) {
-  var i = -1, n = pseudoarray.length, array = [];
-  while (++i < n) array.push(pseudoarray[i]);
-  return array;
-}
-
-function d3_arraySlice(pseudoarray) {
-  return Array.prototype.slice.call(pseudoarray);
-}
-
-try {
-  d3_array(document.documentElement.childNodes)[0].nodeType;
-} catch(e) {
-  d3_array = d3_arrayCopy;
-}
-
-var d3_arraySubclass = [].__proto__?
-
-// Until ECMAScript supports array subclassing, prototype injection works well.
-function(array, prototype) {
-  array.__proto__ = prototype;
-}:
-
-// And if your browser doesn't support __proto__, we'll use direct extension.
-function(array, prototype) {
-  for (var property in prototype) array[property] = prototype[property];
-};
-function d3_this() {
-  return this;
-}
-d3.functor = function(v) {
-  return typeof v === "function" ? v : function() { return v; };
-};
-// Copies a variable number of methods from source to target.
-d3.rebind = function(target, source) {
-  var i = 1, n = arguments.length, method;
-  while (++i < n) target[method = arguments[i]] = d3_rebind(target, source, source[method]);
-  return target;
-};
-
-// Method is assumed to be a standard D3 getter-setter:
-// If passed with no arguments, gets the value.
-// If passed with arguments, sets the value and returns the target.
-function d3_rebind(target, source, method) {
-  return function() {
-    var value = method.apply(source, arguments);
-    return arguments.length ? target : value;
-  };
-}
-d3.ascending = function(a, b) {
-  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
-};
-d3.descending = function(a, b) {
-  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
-};
-d3.mean = function(array, f) {
-  var n = array.length,
-      a,
-      m = 0,
-      i = -1,
-      j = 0;
-  if (arguments.length === 1) {
-    while (++i < n) if (d3_number(a = array[i])) m += (a - m) / ++j;
-  } else {
-    while (++i < n) if (d3_number(a = f.call(array, array[i], i))) m += (a - m) / ++j;
-  }
-  return j ? m : undefined;
-};
-d3.median = function(array, f) {
-  if (arguments.length > 1) array = array.map(f);
-  array = array.filter(d3_number);
-  return array.length ? d3.quantile(array.sort(d3.ascending), .5) : undefined;
-};
-d3.min = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
-  } else {
-    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
-  }
-  return a;
-};
-d3.max = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = array[i]) != null && b > a) a = b;
-  } else {
-    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null && b > a) a = b;
-  }
-  return a;
-};
-d3.extent = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b,
-      c;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = c = array[i]) == null || a != a)) a = c = undefined;
-    while (++i < n) if ((b = array[i]) != null) {
-      if (a > b) a = b;
-      if (c < b) c = b;
-    }
-  } else {
-    while (++i < n && ((a = c = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null) {
-      if (a > b) a = b;
-      if (c < b) c = b;
-    }
-  }
-  return [a, c];
-};
-d3.random = {
-  normal: function(mean, deviation) {
-    if (arguments.length < 2) deviation = 1;
-    if (arguments.length < 1) mean = 0;
-    return function() {
-      var x, y, r;
-      do {
-        x = Math.random() * 2 - 1;
-        y = Math.random() * 2 - 1;
-        r = x * x + y * y;
-      } while (!r || r > 1);
-      return mean + deviation * x * Math.sqrt(-2 * Math.log(r) / r);
-    };
-  }
-};
-function d3_number(x) {
-  return x != null && !isNaN(x);
-}
-d3.sum = function(array, f) {
-  var s = 0,
-      n = array.length,
-      a,
-      i = -1;
-
-  if (arguments.length === 1) {
-    while (++i < n) if (!isNaN(a = +array[i])) s += a;
-  } else {
-    while (++i < n) if (!isNaN(a = +f.call(array, array[i], i))) s += a;
-  }
-
-  return s;
-};
-// R-7 per <http://en.wikipedia.org/wiki/Quantile>
-d3.quantile = function(values, p) {
-  var H = (values.length - 1) * p + 1,
-      h = Math.floor(H),
-      v = values[h - 1],
-      e = H - h;
-  return e ? v + e * (values[h] - v) : v;
-};
-d3.transpose = function(matrix) {
-  return d3.zip.apply(d3, matrix);
-};
-d3.zip = function() {
-  if (!(n = arguments.length)) return [];
-  for (var i = -1, m = d3.min(arguments, d3_zipLength), zips = new Array(m); ++i < m;) {
-    for (var j = -1, n, zip = zips[i] = new Array(n); ++j < n;) {
-      zip[j] = arguments[j][i];
-    }
-  }
-  return zips;
-};
-
-function d3_zipLength(d) {
-  return d.length;
-}
-// Locate the insertion point for x in a to maintain sorted order. The
-// arguments lo and hi may be used to specify a subset of the array which should
-// be considered; by default the entire array is used. If x is already present
-// in a, the insertion point will be before (to the left of) any existing
-// entries. The return value is suitable for use as the first argument to
-// `array.splice` assuming that a is already sorted.
-//
-// The returned insertion point i partitions the array a into two halves so that
-// all v < x for v in a[lo:i] for the left side and all v >= x for v in a[i:hi]
-// for the right side.
-d3.bisectLeft = function(a, x, lo, hi) {
-  if (arguments.length < 3) lo = 0;
-  if (arguments.length < 4) hi = a.length;
-  while (lo < hi) {
-    var mid = (lo + hi) >> 1;
-    if (a[mid] < x) lo = mid + 1;
-    else hi = mid;
-  }
-  return lo;
-};
-
-// Similar to bisectLeft, but returns an insertion point which comes after (to
-// the right of) any existing entries of x in a.
-//
-// The returned insertion point i partitions the array into two halves so that
-// all v <= x for v in a[lo:i] for the left side and all v > x for v in a[i:hi]
-// for the right side.
-d3.bisect =
-d3.bisectRight = function(a, x, lo, hi) {
-  if (arguments.length < 3) lo = 0;
-  if (arguments.length < 4) hi = a.length;
-  while (lo < hi) {
-    var mid = (lo + hi) >> 1;
-    if (x < a[mid]) hi = mid;
-    else lo = mid + 1;
-  }
-  return lo;
-};
-d3.first = function(array, f) {
-  var i = 0,
-      n = array.length,
-      a = array[0],
-      b;
-  if (arguments.length === 1) f = d3.ascending;
-  while (++i < n) {
-    if (f.call(array, a, b = array[i]) > 0) {
-      a = b;
-    }
-  }
-  return a;
-};
-d3.last = function(array, f) {
-  var i = 0,
-      n = array.length,
-      a = array[0],
-      b;
-  if (arguments.length === 1) f = d3.ascending;
-  while (++i < n) {
-    if (f.call(array, a, b = array[i]) <= 0) {
-      a = b;
-    }
-  }
-  return a;
-};
-d3.nest = function() {
-  var nest = {},
-      keys = [],
-      sortKeys = [],
-      sortValues,
-      rollup;
-
-  function map(array, depth) {
-    if (depth >= keys.length) return rollup
-        ? rollup.call(nest, array) : (sortValues
-        ? array.sort(sortValues)
-        : array);
-
-    var i = -1,
-        n = array.length,
-        key = keys[depth++],
-        keyValue,
-        object,
-        o = {};
-
-    while (++i < n) {
-      if ((keyValue = key(object = array[i])) in o) {
-        o[keyValue].push(object);
-      } else {
-        o[keyValue] = [object];
-      }
-    }
-
-    for (keyValue in o) {
-      o[keyValue] = map(o[keyValue], depth);
-    }
-
-    return o;
-  }
-
-  function entries(map, depth) {
-    if (depth >= keys.length) return map;
-
-    var a = [],
-        sortKey = sortKeys[depth++],
-        key;
-
-    for (key in map) {
-      a.push({key: key, values: entries(map[key], depth)});
-    }
-
-    if (sortKey) a.sort(function(a, b) {
-      return sortKey(a.key, b.key);
-    });
-
-    return a;
-  }
-
-  nest.map = function(array) {
-    return map(array, 0);
-  };
-
-  nest.entries = function(array) {
-    return entries(map(array, 0), 0);
-  };
-
-  nest.key = function(d) {
-    keys.push(d);
-    return nest;
-  };
-
-  // Specifies the order for the most-recently specified key.
-  // Note: only applies to entries. Map keys are unordered!
-  nest.sortKeys = function(order) {
-    sortKeys[keys.length - 1] = order;
-    return nest;
-  };
-
-  // Specifies the order for leaf values.
-  // Applies to both maps and entries array.
-  nest.sortValues = function(order) {
-    sortValues = order;
-    return nest;
-  };
-
-  nest.rollup = function(f) {
-    rollup = f;
-    return nest;
-  };
-
-  return nest;
-};
-d3.keys = function(map) {
-  var keys = [];
-  for (var key in map) keys.push(key);
-  return keys;
-};
-d3.values = function(map) {
-  var values = [];
-  for (var key in map) values.push(map[key]);
-  return values;
-};
-d3.entries = function(map) {
-  var entries = [];
-  for (var key in map) entries.push({key: key, value: map[key]});
-  return entries;
-};
-d3.permute = function(array, indexes) {
-  var permutes = [],
-      i = -1,
-      n = indexes.length;
-  while (++i < n) permutes[i] = array[indexes[i]];
-  return permutes;
-};
-d3.merge = function(arrays) {
-  return Array.prototype.concat.apply([], arrays);
-};
-d3.split = function(array, f) {
-  var arrays = [],
-      values = [],
-      value,
-      i = -1,
-      n = array.length;
-  if (arguments.length < 2) f = d3_splitter;
-  while (++i < n) {
-    if (f.call(values, value = array[i], i)) {
-      values = [];
-    } else {
-      if (!values.length) arrays.push(values);
-      values.push(value);
-    }
-  }
-  return arrays;
-};
-
-function d3_splitter(d) {
-  return d == null;
-}
-function d3_collapse(s) {
-  return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
-}
-/**
- * @param {number} start
- * @param {number=} stop
- * @param {number=} step
- */
-d3.range = function(start, stop, step) {
-  if (arguments.length < 3) {
-    step = 1;
-    if (arguments.length < 2) {
-      stop = start;
-      start = 0;
-    }
-  }
-  if ((stop - start) / step == Infinity) throw new Error("infinite range");
-  var range = [],
-       i = -1,
-       j;
-  if (step < 0) while ((j = start + step * ++i) > stop) range.push(j);
-  else while ((j = start + step * ++i) < stop) range.push(j);
-  return range;
-};
-d3.requote = function(s) {
-  return s.replace(d3_requote_re, "\\$&");
-};
-
-var d3_requote_re = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;
-d3.round = function(x, n) {
-  return n
-      ? Math.round(x * Math.pow(10, n)) * Math.pow(10, -n)
-      : Math.round(x);
-};
-d3.xhr = function(url, mime, callback) {
-  var req = new XMLHttpRequest;
-  if (arguments.length < 3) callback = mime, mime = null;
-  else if (mime && req.overrideMimeType) req.overrideMimeType(mime);
-  req.open("GET", url, true);
-  if (mime) req.setRequestHeader("Accept", mime);
-  req.onreadystatechange = function() {
-    if (req.readyState === 4) callback(req.status < 300 ? req : null);
-  };
-  req.send(null);
-};
-d3.text = function(url, mime, callback) {
-  function ready(req) {
-    callback(req && req.responseText);
-  }
-  if (arguments.length < 3) {
-    callback = mime;
-    mime = null;
-  }
-  d3.xhr(url, mime, ready);
-};
-d3.json = function(url, callback) {
-  d3.text(url, "application/json", function(text) {
-    callback(text ? JSON.parse(text) : null);
-  });
-};
-d3.html = function(url, callback) {
-  d3.text(url, "text/html", function(text) {
-    if (text != null) { // Treat empty string as valid HTML.
-      var range = document.createRange();
-      range.selectNode(document.body);
-      text = range.createContextualFragment(text);
-    }
-    callback(text);
-  });
-};
-d3.xml = function(url, mime, callback) {
-  function ready(req) {
-    callback(req && req.responseXML);
-  }
-  if (arguments.length < 3) {
-    callback = mime;
-    mime = null;
-  }
-  d3.xhr(url, mime, ready);
-};
-var d3_nsPrefix = {
-  svg: "http://www.w3.org/2000/svg",
-  xhtml: "http://www.w3.org/1999/xhtml",
-  xlink: "http://www.w3.org/1999/xlink",
-  xml: "http://www.w3.org/XML/1998/namespace",
-  xmlns: "http://www.w3.org/2000/xmlns/"
-};
-
-d3.ns = {
-  prefix: d3_nsPrefix,
-  qualify: function(name) {
-    var i = name.indexOf(":");
-    return i < 0 ? (name in d3_nsPrefix
-      ? {space: d3_nsPrefix[name], local: name} : name)
-      : {space: d3_nsPrefix[name.substring(0, i)], local: name.substring(i + 1)};
-  }
-};
-d3.dispatch = function() {
-  var dispatch = new d3_dispatch(),
-      i = -1,
-      n = arguments.length;
-  while (++i < n) dispatch[arguments[i]] = d3_dispatch_event();
-  return dispatch;
-};
-
-function d3_dispatch() {}
-
-d3_dispatch.prototype.on = function(type, listener) {
-  var i = type.indexOf("."),
-      name = "";
-
-  // Extract optional namespace, e.g., "click.foo"
-  if (i > 0) {
-    name = type.substring(i + 1);
-    type = type.substring(0, i);
-  }
-
-  return arguments.length < 2
-      ? this[type].on(name)
-      : (this[type].on(name, listener), this);
-};
-
-function d3_dispatch_event() {
-  var listeners = [],
-      listenerByName = {};
-
-  function dispatch() {
-    var z = listeners, // defensive reference
-        i = -1,
-        n = z.length,
-        l;
-    while (++i < n) if (l = z[i].on) l.apply(this, arguments);
-  }
-
-  dispatch.on = function(name, listener) {
-    var l, i;
-
-    // return the current listener, if any
-    if (arguments.length < 2) return (l = listenerByName[name]) && l.on;
-
-    // remove the old listener, if any (with copy-on-write)
-    if (l = listenerByName[name]) {
-      l.on = null;
-      listeners = listeners.slice(0, i = listeners.indexOf(l)).concat(listeners.slice(i + 1));
-      delete listenerByName[name];
-    }
-
-    // add the new listener, if any
-    if (listener) {
-      listeners.push(listenerByName[name] = {on: listener});
-    }
-
-    return dispatch;
-  };
-
-  return dispatch;
-};
-// TODO align
-d3.format = function(specifier) {
-  var match = d3_format_re.exec(specifier),
-      fill = match[1] || " ",
-      sign = match[3] || "",
-      zfill = match[5],
-      width = +match[6],
-      comma = match[7],
-      precision = match[8],
-      type = match[9],
-      scale = 1,
-      suffix = "",
-      integer = false;
-
-  if (precision) precision = +precision.substring(1);
-
-  if (zfill) {
-    fill = "0"; // TODO align = "=";
-    if (comma) width -= Math.floor((width - 1) / 4);
-  }
-
-  switch (type) {
-    case "n": comma = true; type = "g"; break;
-    case "%": scale = 100; suffix = "%"; type = "f"; break;
-    case "p": scale = 100; suffix = "%"; type = "r"; break;
-    case "d": integer = true; precision = 0; break;
-    case "s": scale = -1; type = "r"; break;
-  }
-
-  // If no precision is specified for r, fallback to general notation.
-  if (type == "r" && !precision) type = "g";
-
-  type = d3_format_types[type] || d3_format_typeDefault;
-
-  return function(value) {
-
-    // Return the empty string for floats formatted as ints.
-    if (integer && (value % 1)) return "";
-
-    // Convert negative to positive, and record the sign prefix.
-    var negative = (value < 0) && (value = -value) ? "\u2212" : sign;
-
-    // Apply the scale, computing it from the value's exponent for si format.
-    if (scale < 0) {
-      var prefix = d3.formatPrefix(value, precision);
-      value *= prefix.scale;
-      suffix = prefix.symbol;
-    } else {
-      value *= scale;
-    }
-
-    // Convert to the desired precision.
-    value = type(value, precision);
-
-    // If the fill character is 0, the sign and group is applied after the fill.
-    if (zfill) {
-      var length = value.length + negative.length;
-      if (length < width) value = new Array(width - length + 1).join(fill) + value;
-      if (comma) value = d3_format_group(value);
-      value = negative + value;
-    }
-
-    // Otherwise (e.g., space-filling), the sign and group is applied before.
-    else {
-      if (comma) value = d3_format_group(value);
-      value = negative + value;
-      var length = value.length;
-      if (length < width) value = new Array(width - length + 1).join(fill) + value;
-    }
-
-    return value + suffix;
-  };
-};
-
-// [[fill]align][sign][#][0][width][,][.precision][type]
-var d3_format_re = /(?:([^{])?([<>=^]))?([+\- ])?(#)?(0)?([0-9]+)?(,)?(\.[0-9]+)?([a-zA-Z%])?/;
-
-var d3_format_types = {
-  g: function(x, p) { return x.toPrecision(p); },
-  e: function(x, p) { return x.toExponential(p); },
-  f: function(x, p) { return x.toFixed(p); },
-  r: function(x, p) { return d3.round(x, p = d3_format_precision(x, p)).toFixed(Math.max(0, Math.min(20, p))); }
-};
-
-function d3_format_precision(x, p) {
-  return p - (x ? 1 + Math.floor(Math.log(x + Math.pow(10, 1 + Math.floor(Math.log(x) / Math.LN10) - p)) / Math.LN10) : 1);
-}
-
-function d3_format_typeDefault(x) {
-  return x + "";
-}
-
-// Apply comma grouping for thousands.
-function d3_format_group(value) {
-  var i = value.lastIndexOf("."),
-      f = i >= 0 ? value.substring(i) : (i = value.length, ""),
-      t = [];
-  while (i > 0) t.push(value.substring(i -= 3, i + 3));
-  return t.reverse().join(",") + f;
-}
-var d3_formatPrefixes = ["y","z","a","f","p","n","μ","m","","k","M","G","T","P","E","Z","Y"].map(d3_formatPrefix);
-
-d3.formatPrefix = function(value, precision) {
-  var i = 0;
-  if (value) {
-    if (value < 0) value *= -1;
-    if (precision) value = d3.round(value, d3_format_precision(value, precision));
-    i = 1 + Math.floor(1e-12 + Math.log(value) / Math.LN10);
-    i = Math.max(-24, Math.min(24, Math.floor((i <= 0 ? i + 1 : i - 1) / 3) * 3));
-  }
-  return d3_formatPrefixes[8 + i / 3];
-};
-
-function d3_formatPrefix(d, i) {
-  return {
-    scale: Math.pow(10, (8 - i) * 3),
-    symbol: d
-  };
-}
-
-/*
- * TERMS OF USE - EASING EQUATIONS
- *
- * Open source under the BSD License.
- *
- * Copyright 2001 Robert Penner
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * - Redistributions of source code must retain the above copyright notice, this
- *   list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright notice,
- *   this list of conditions and the following disclaimer in the documentation
- *   and/or other materials provided with the distribution.
- *
- * - Neither the name of the author nor the names of contributors may be used to
- *   endorse or promote products derived from this software without specific
- *   prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-var d3_ease_quad = d3_ease_poly(2),
-    d3_ease_cubic = d3_ease_poly(3);
-
-var d3_ease = {
-  linear: function() { return d3_ease_linear; },
-  poly: d3_ease_poly,
-  quad: function() { return d3_ease_quad; },
-  cubic: function() { return d3_ease_cubic; },
-  sin: function() { return d3_ease_sin; },
-  exp: function() { return d3_ease_exp; },
-  circle: function() { return d3_ease_circle; },
-  elastic: d3_ease_elastic,
-  back: d3_ease_back,
-  bounce: function() { return d3_ease_bounce; }
-};
-
-var d3_ease_mode = {
-  "in": function(f) { return f; },
-  "out": d3_ease_reverse,
-  "in-out": d3_ease_reflect,
-  "out-in": function(f) { return d3_ease_reflect(d3_ease_reverse(f)); }
-};
-
-d3.ease = function(name) {
-  var i = name.indexOf("-"),
-      t = i >= 0 ? name.substring(0, i) : name,
-      m = i >= 0 ? name.substring(i + 1) : "in";
-  return d3_ease_clamp(d3_ease_mode[m](d3_ease[t].apply(null, Array.prototype.slice.call(arguments, 1))));
-};
-
-function d3_ease_clamp(f) {
-  return function(t) {
-    return t <= 0 ? 0 : t >= 1 ? 1 : f(t);
-  };
-}
-
-function d3_ease_reverse(f) {
-  return function(t) {
-    return 1 - f(1 - t);
-  };
-}
-
-function d3_ease_reflect(f) {
-  return function(t) {
-    return .5 * (t < .5 ? f(2 * t) : (2 - f(2 - 2 * t)));
-  };
-}
-
-function d3_ease_linear(t) {
-  return t;
-}
-
-function d3_ease_poly(e) {
-  return function(t) {
-    return Math.pow(t, e);
-  }
-}
-
-function d3_ease_sin(t) {
-  return 1 - Math.cos(t * Math.PI / 2);
-}
-
-function d3_ease_exp(t) {
-  return Math.pow(2, 10 * (t - 1));
-}
-
-function d3_ease_circle(t) {
-  return 1 - Math.sqrt(1 - t * t);
-}
-
-function d3_ease_elastic(a, p) {
-  var s;
-  if (arguments.length < 2) p = 0.45;
-  if (arguments.length < 1) { a = 1; s = p / 4; }
-  else s = p / (2 * Math.PI) * Math.asin(1 / a);
-  return function(t) {
-    return 1 + a * Math.pow(2, 10 * -t) * Math.sin((t - s) * 2 * Math.PI / p);
-  };
-}
-
-function d3_ease_back(s) {
-  if (!s) s = 1.70158;
-  return function(t) {
-    return t * t * ((s + 1) * t - s);
-  };
-}
-
-function d3_ease_bounce(t) {
-  return t < 1 / 2.75 ? 7.5625 * t * t
-      : t < 2 / 2.75 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75
-      : t < 2.5 / 2.75 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375
-      : 7.5625 * (t -= 2.625 / 2.75) * t + .984375;
-}
-d3.event = null;
-
-function d3_eventCancel() {
-  d3.event.stopPropagation();
-  d3.event.preventDefault();
-}
-d3.interpolate = function(a, b) {
-  var i = d3.interpolators.length, f;
-  while (--i >= 0 && !(f = d3.interpolators[i](a, b)));
-  return f;
-};
-
-d3.interpolateNumber = function(a, b) {
-  b -= a;
-  return function(t) { return a + b * t; };
-};
-
-d3.interpolateRound = function(a, b) {
-  b -= a;
-  return function(t) { return Math.round(a + b * t); };
-};
-
-d3.interpolateString = function(a, b) {
-  var m, // current match
-      i, // current index
-      j, // current index (for coallescing)
-      s0 = 0, // start index of current string prefix
-      s1 = 0, // end index of current string prefix
-      s = [], // string constants and placeholders
-      q = [], // number interpolators
-      n, // q.length
-      o;
-
-  // Reset our regular expression!
-  d3_interpolate_number.lastIndex = 0;
-
-  // Find all numbers in b.
-  for (i = 0; m = d3_interpolate_number.exec(b); ++i) {
-    if (m.index) s.push(b.substring(s0, s1 = m.index));
-    q.push({i: s.length, x: m[0]});
-    s.push(null);
-    s0 = d3_interpolate_number.lastIndex;
-  }
-  if (s0 < b.length) s.push(b.substring(s0));
-
-  // Find all numbers in a.
-  for (i = 0, n = q.length; (m = d3_interpolate_number.exec(a)) && i < n; ++i) {
-    o = q[i];
-    if (o.x == m[0]) { // The numbers match, so coallesce.
-      if (o.i) {
-        if (s[o.i + 1] == null) { // This match is followed by another number.
-          s[o.i - 1] += o.x;
-          s.splice(o.i, 1);
-          for (j = i + 1; j < n; ++j) q[j].i--;
-        } else { // This match is followed by a string, so coallesce twice.
-          s[o.i - 1] += o.x + s[o.i + 1];
-          s.splice(o.i, 2);
-          for (j = i + 1; j < n; ++j) q[j].i -= 2;
-        }
-      } else {
-          if (s[o.i + 1] == null) { // This match is followed by another number.
-          s[o.i] = o.x;
-        } else { // This match is followed by a string, so coallesce twice.
-          s[o.i] = o.x + s[o.i + 1];
-          s.splice(o.i + 1, 1);
-          for (j = i + 1; j < n; ++j) q[j].i--;
-        }
-      }
-      q.splice(i, 1);
-      n--;
-      i--;
-    } else {
-      o.x = d3.interpolateNumber(parseFloat(m[0]), parseFloat(o.x));
-    }
-  }
-
-  // Remove any numbers in b not found in a.
-  while (i < n) {
-    o = q.pop();
-    if (s[o.i + 1] == null) { // This match is followed by another number.
-      s[o.i] = o.x;
-    } else { // This match is followed by a string, so coallesce twice.
-      s[o.i] = o.x + s[o.i + 1];
-      s.splice(o.i + 1, 1);
-    }
-    n--;
-  }
-
-  // Special optimization for only a single match.
-  if (s.length === 1) {
-    return s[0] == null ? q[0].x : function() { return b; };
-  }
-
-  // Otherwise, interpolate each of the numbers and rejoin the string.
-  return function(t) {
-    for (i = 0; i < n; ++i) s[(o = q[i]).i] = o.x(t);
-    return s.join("");
-  };
-};
-
-d3.interpolateTransform = function(a, b) {
-  return d3.interpolateString(d3.transform(a) + "", d3.transform(b) + "");
-};
-
-d3.interpolateRgb = function(a, b) {
-  a = d3.rgb(a);
-  b = d3.rgb(b);
-  var ar = a.r,
-      ag = a.g,
-      ab = a.b,
-      br = b.r - ar,
-      bg = b.g - ag,
-      bb = b.b - ab;
-  return function(t) {
-    return "#"
-        + d3_rgb_hex(Math.round(ar + br * t))
-        + d3_rgb_hex(Math.round(ag + bg * t))
-        + d3_rgb_hex(Math.round(ab + bb * t));
-  };
-};
-
-// interpolates HSL space, but outputs RGB string (for compatibility)
-d3.interpolateHsl = function(a, b) {
-  a = d3.hsl(a);
-  b = d3.hsl(b);
-  var h0 = a.h,
-      s0 = a.s,
-      l0 = a.l,
-      h1 = b.h - h0,
-      s1 = b.s - s0,
-      l1 = b.l - l0;
-  return function(t) {
-    return d3_hsl_rgb(h0 + h1 * t, s0 + s1 * t, l0 + l1 * t).toString();
-  };
-};
-
-d3.interpolateArray = function(a, b) {
-  var x = [],
-      c = [],
-      na = a.length,
-      nb = b.length,
-      n0 = Math.min(a.length, b.length),
-      i;
-  for (i = 0; i < n0; ++i) x.push(d3.interpolate(a[i], b[i]));
-  for (; i < na; ++i) c[i] = a[i];
-  for (; i < nb; ++i) c[i] = b[i];
-  return function(t) {
-    for (i = 0; i < n0; ++i) c[i] = x[i](t);
-    return c;
-  };
-};
-
-d3.interpolateObject = function(a, b) {
-  var i = {},
-      c = {},
-      k;
-  for (k in a) {
-    if (k in b) {
-      i[k] = d3_interpolateByName(k)(a[k], b[k]);
-    } else {
-      c[k] = a[k];
-    }
-  }
-  for (k in b) {
-    if (!(k in a)) {
-      c[k] = b[k];
-    }
-  }
-  return function(t) {
-    for (k in i) c[k] = i[k](t);
-    return c;
-  };
-}
-
-var d3_interpolate_number = /[-+]?(?:\d*\.?\d+)(?:[eE][-+]?\d+)?/g;
-
-function d3_interpolateByName(n) {
-  return n == "transform"
-      ? d3.interpolateTransform
-      : d3.interpolate;
-}
-
-d3.interpolators = [
-  d3.interpolateObject,
-  function(a, b) { return (b instanceof Array) && d3.interpolateArray(a, b); },
-  function(a, b) { return (typeof a === "string" || typeof b === "string") && d3.interpolateString(a + "", b + ""); },
-  function(a, b) { return (typeof b === "string" ? b in d3_rgb_names || /^(#|rgb\(|hsl\()/.test(b) : b instanceof d3_Rgb || b instanceof d3_Hsl) && d3.interpolateRgb(a, b); },
-  function(a, b) { return !isNaN(a = +a) && !isNaN(b = +b) && d3.interpolateNumber(a, b); }
-];
-function d3_uninterpolateNumber(a, b) {
-  b = b - (a = +a) ? 1 / (b - a) : 0;
-  return function(x) { return (x - a) * b; };
-}
-
-function d3_uninterpolateClamp(a, b) {
-  b = b - (a = +a) ? 1 / (b - a) : 0;
-  return function(x) { return Math.max(0, Math.min(1, (x - a) * b)); };
-}
-d3.rgb = function(r, g, b) {
-  return arguments.length === 1
-      ? (r instanceof d3_Rgb ? d3_rgb(r.r, r.g, r.b)
-      : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb))
-      : d3_rgb(~~r, ~~g, ~~b);
-};
-
-function d3_rgb(r, g, b) {
-  return new d3_Rgb(r, g, b);
-}
-
-function d3_Rgb(r, g, b) {
-  this.r = r;
-  this.g = g;
-  this.b = b;
-}
-
-d3_Rgb.prototype.brighter = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  var r = this.r,
-      g = this.g,
-      b = this.b,
-      i = 30;
-  if (!r && !g && !b) return d3_rgb(i, i, i);
-  if (r && r < i) r = i;
-  if (g && g < i) g = i;
-  if (b && b < i) b = i;
-  return d3_rgb(
-      Math.min(255, Math.floor(r / k)),
-      Math.min(255, Math.floor(g / k)),
-      Math.min(255, Math.floor(b / k)));
-};
-
-d3_Rgb.prototype.darker = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_rgb(
-      Math.floor(k * this.r),
-      Math.floor(k * this.g),
-      Math.floor(k * this.b));
-};
-
-d3_Rgb.prototype.hsl = function() {
-  return d3_rgb_hsl(this.r, this.g, this.b);
-};
-
-d3_Rgb.prototype.toString = function() {
-  return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b);
-};
-
-function d3_rgb_hex(v) {
-  return v < 0x10
-      ? "0" + Math.max(0, v).toString(16)
-      : Math.min(255, v).toString(16);
-}
-
-function d3_rgb_parse(format, rgb, hsl) {
-  var r = 0, // red channel; int in [0, 255]
-      g = 0, // green channel; int in [0, 255]
-      b = 0, // blue channel; int in [0, 255]
-      m1, // CSS color specification match
-      m2, // CSS color specification type (e.g., rgb)
-      name;
-
-  /* Handle hsl, rgb. */
-  m1 = /([a-z]+)\((.*)\)/i.exec(format);
-  if (m1) {
-    m2 = m1[2].split(",");
-    switch (m1[1]) {
-      case "hsl": {
-        return hsl(
-          parseFloat(m2[0]), // degrees
-          parseFloat(m2[1]) / 100, // percentage
-          parseFloat(m2[2]) / 100 // percentage
-        );
-      }
-      case "rgb": {
-        return rgb(
-          d3_rgb_parseNumber(m2[0]),
-          d3_rgb_parseNumber(m2[1]),
-          d3_rgb_parseNumber(m2[2])
-        );
-      }
-    }
-  }
-
-  /* Named colors. */
-  if (name = d3_rgb_names[format]) return rgb(name.r, name.g, name.b);
-
-  /* Hexadecimal colors: #rgb and #rrggbb. */
-  if (format != null && format.charAt(0) === "#") {
-    if (format.length === 4) {
-      r = format.charAt(1); r += r;
-      g = format.charAt(2); g += g;
-      b = format.charAt(3); b += b;
-    } else if (format.length === 7) {
-      r = format.substring(1, 3);
-      g = format.substring(3, 5);
-      b = format.substring(5, 7);
-    }
-    r = parseInt(r, 16);
-    g = parseInt(g, 16);
-    b = parseInt(b, 16);
-  }
-
-  return rgb(r, g, b);
-}
-
-function d3_rgb_hsl(r, g, b) {
-  var min = Math.min(r /= 255, g /= 255, b /= 255),
-      max = Math.max(r, g, b),
-      d = max - min,
-      h,
-      s,
-      l = (max + min) / 2;
-  if (d) {
-    s = l < .5 ? d / (max + min) : d / (2 - max - min);
-    if (r == max) h = (g - b) / d + (g < b ? 6 : 0);
-    else if (g == max) h = (b - r) / d + 2;
-    else h = (r - g) / d + 4;
-    h *= 60;
-  } else {
-    s = h = 0;
-  }
-  return d3_hsl(h, s, l);
-}
-
-function d3_rgb_parseNumber(c) { // either integer or percentage
-  var f = parseFloat(c);
-  return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f;
-}
-
-var d3_rgb_names = {
-  aliceblue: "#f0f8ff",
-  antiquewhite: "#faebd7",
-  aqua: "#00ffff",
-  aquamarine: "#7fffd4",
-  azure: "#f0ffff",
-  beige: "#f5f5dc",
-  bisque: "#ffe4c4",
-  black: "#000000",
-  blanchedalmond: "#ffebcd",
-  blue: "#0000ff",
-  blueviolet: "#8a2be2",
-  brown: "#a52a2a",
-  burlywood: "#deb887",
-  cadetblue: "#5f9ea0",
-  chartreuse: "#7fff00",
-  chocolate: "#d2691e",
-  coral: "#ff7f50",
-  cornflowerblue: "#6495ed",
-  cornsilk: "#fff8dc",
-  crimson: "#dc143c",
-  cyan: "#00ffff",
-  darkblue: "#00008b",
-  darkcyan: "#008b8b",
-  darkgoldenrod: "#b8860b",
-  darkgray: "#a9a9a9",
-  darkgreen: "#006400",
-  darkgrey: "#a9a9a9",
-  darkkhaki: "#bdb76b",
-  darkmagenta: "#8b008b",
-  darkolivegreen: "#556b2f",
-  darkorange: "#ff8c00",
-  darkorchid: "#9932cc",
-  darkred: "#8b0000",
-  darksalmon: "#e9967a",
-  darkseagreen: "#8fbc8f",
-  darkslateblue: "#483d8b",
-  darkslategray: "#2f4f4f",
-  darkslategrey: "#2f4f4f",
-  darkturquoise: "#00ced1",
-  darkviolet: "#9400d3",
-  deeppink: "#ff1493",
-  deepskyblue: "#00bfff",
-  dimgray: "#696969",
-  dimgrey: "#696969",
-  dodgerblue: "#1e90ff",
-  firebrick: "#b22222",
-  floralwhite: "#fffaf0",
-  forestgreen: "#228b22",
-  fuchsia: "#ff00ff",
-  gainsboro: "#dcdcdc",
-  ghostwhite: "#f8f8ff",
-  gold: "#ffd700",
-  goldenrod: "#daa520",
-  gray: "#808080",
-  green: "#008000",
-  greenyellow: "#adff2f",
-  grey: "#808080",
-  honeydew: "#f0fff0",
-  hotpink: "#ff69b4",
-  indianred: "#cd5c5c",
-  indigo: "#4b0082",
-  ivory: "#fffff0",
-  khaki: "#f0e68c",
-  lavender: "#e6e6fa",
-  lavenderblush: "#fff0f5",
-  lawngreen: "#7cfc00",
-  lemonchiffon: "#fffacd",
-  lightblue: "#add8e6",
-  lightcoral: "#f08080",
-  lightcyan: "#e0ffff",
-  lightgoldenrodyellow: "#fafad2",
-  lightgray: "#d3d3d3",
-  lightgreen: "#90ee90",
-  lightgrey: "#d3d3d3",
-  lightpink: "#ffb6c1",
-  lightsalmon: "#ffa07a",
-  lightseagreen: "#20b2aa",
-  lightskyblue: "#87cefa",
-  lightslategray: "#778899",
-  lightslategrey: "#778899",
-  lightsteelblue: "#b0c4de",
-  lightyellow: "#ffffe0",
-  lime: "#00ff00",
-  limegreen: "#32cd32",
-  linen: "#faf0e6",
-  magenta: "#ff00ff",
-  maroon: "#800000",
-  mediumaquamarine: "#66cdaa",
-  mediumblue: "#0000cd",
-  mediumorchid: "#ba55d3",
-  mediumpurple: "#9370db",
-  mediumseagreen: "#3cb371",
-  mediumslateblue: "#7b68ee",
-  mediumspringgreen: "#00fa9a",
-  mediumturquoise: "#48d1cc",
-  mediumvioletred: "#c71585",
-  midnightblue: "#191970",
-  mintcream: "#f5fffa",
-  mistyrose: "#ffe4e1",
-  moccasin: "#ffe4b5",
-  navajowhite: "#ffdead",
-  navy: "#000080",
-  oldlace: "#fdf5e6",
-  olive: "#808000",
-  olivedrab: "#6b8e23",
-  orange: "#ffa500",
-  orangered: "#ff4500",
-  orchid: "#da70d6",
-  palegoldenrod: "#eee8aa",
-  palegreen: "#98fb98",
-  paleturquoise: "#afeeee",
-  palevioletred: "#db7093",
-  papayawhip: "#ffefd5",
-  peachpuff: "#ffdab9",
-  peru: "#cd853f",
-  pink: "#ffc0cb",
-  plum: "#dda0dd",
-  powderblue: "#b0e0e6",
-  purple: "#800080",
-  red: "#ff0000",
-  rosybrown: "#bc8f8f",
-  royalblue: "#4169e1",
-  saddlebrown: "#8b4513",
-  salmon: "#fa8072",
-  sandybrown: "#f4a460",
-  seagreen: "#2e8b57",
-  seashell: "#fff5ee",
-  sienna: "#a0522d",
-  silver: "#c0c0c0",
-  skyblue: "#87ceeb",
-  slateblue: "#6a5acd",
-  slategray: "#708090",
-  slategrey: "#708090",
-  snow: "#fffafa",
-  springgreen: "#00ff7f",
-  steelblue: "#4682b4",
-  tan: "#d2b48c",
-  teal: "#008080",
-  thistle: "#d8bfd8",
-  tomato: "#ff6347",
-  turquoise: "#40e0d0",
-  violet: "#ee82ee",
-  wheat: "#f5deb3",
-  white: "#ffffff",
-  whitesmoke: "#f5f5f5",
-  yellow: "#ffff00",
-  yellowgreen: "#9acd32"
-};
-
-for (var d3_rgb_name in d3_rgb_names) {
-  d3_rgb_names[d3_rgb_name] = d3_rgb_parse(
-      d3_rgb_names[d3_rgb_name],
-      d3_rgb,
-      d3_hsl_rgb);
-}
-d3.hsl = function(h, s, l) {
-  return arguments.length === 1
-      ? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l)
-      : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl))
-      : d3_hsl(+h, +s, +l);
-};
-
-function d3_hsl(h, s, l) {
-  return new d3_Hsl(h, s, l);
-}
-
-function d3_Hsl(h, s, l) {
-  this.h = h;
-  this.s = s;
-  this.l = l;
-}
-
-d3_Hsl.prototype.brighter = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_hsl(this.h, this.s, this.l / k);
-};
-
-d3_Hsl.prototype.darker = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_hsl(this.h, this.s, k * this.l);
-};
-
-d3_Hsl.prototype.rgb = function() {
-  return d3_hsl_rgb(this.h, this.s, this.l);
-};
-
-d3_Hsl.prototype.toString = function() {
-  return this.rgb().toString();
-};
-
-function d3_hsl_rgb(h, s, l) {
-  var m1,
-      m2;
-
-  /* Some simple corrections for h, s and l. */
-  h = h % 360; if (h < 0) h += 360;
-  s = s < 0 ? 0 : s > 1 ? 1 : s;
-  l = l < 0 ? 0 : l > 1 ? 1 : l;
-
-  /* From FvD 13.37, CSS Color Module Level 3 */
-  m2 = l <= .5 ? l * (1 + s) : l + s - l * s;
-  m1 = 2 * l - m2;
-
-  function v(h) {
-    if (h > 360) h -= 360;
-    else if (h < 0) h += 360;
-    if (h < 60) return m1 + (m2 - m1) * h / 60;
-    if (h < 180) return m2;
-    if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;
-    return m1;
-  }
-
-  function vv(h) {
-    return Math.round(v(h) * 255);
-  }
-
-  return d3_rgb(vv(h + 120), vv(h), vv(h - 120));
-}
-function d3_selection(groups) {
-  d3_arraySubclass(groups, d3_selectionPrototype);
-  return groups;
-}
-
-var d3_select = function(s, n) { return n.querySelector(s); },
-    d3_selectAll = function(s, n) { return n.querySelectorAll(s); },
-    d3_selectRoot = document.documentElement,
-    d3_selectMatcher = d3_selectRoot.matchesSelector || d3_selectRoot.webkitMatchesSelector || d3_selectRoot.mozMatchesSelector || d3_selectRoot.msMatchesSelector || d3_selectRoot.oMatchesSelector,
-    d3_selectMatches = function(n, s) { return d3_selectMatcher.call(n, s); };
-
-// Prefer Sizzle, if available.
-if (typeof Sizzle === "function") {
-  d3_select = function(s, n) { return Sizzle(s, n)[0]; };
-  d3_selectAll = function(s, n) { return Sizzle.uniqueSort(Sizzle(s, n)); };
-  d3_selectMatches = Sizzle.matchesSelector;
-}
-
-var d3_selectionPrototype = [];
-
-d3.selection = function() {
-  return d3_selectionRoot;
-};
-
-d3.selection.prototype = d3_selectionPrototype;
-d3_selectionPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      group,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selector(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = (group = this[j]).parentNode;
-    for (var i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroup.push(subnode = selector.call(node, node.__data__, i));
-        if (subnode && "__data__" in node) subnode.__data__ = node.__data__;
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_selector(selector) {
-  return function() {
-    return d3_select(selector, this);
-  };
-}
-d3_selectionPrototype.selectAll = function(selector) {
-  var subgroups = [],
-      subgroup,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroups.push(subgroup = d3_array(selector.call(node, node.__data__, i)));
-        subgroup.parentNode = node;
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_selectorAll(selector) {
-  return function() {
-    return d3_selectAll(selector, this);
-  };
-}
-d3_selectionPrototype.attr = function(name, value) {
-  name = d3.ns.qualify(name);
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) {
-    var node = this.node();
-    return name.local
-        ? node.getAttributeNS(name.space, name.local)
-        : node.getAttribute(name);
-  }
-
-  function attrNull() {
-    this.removeAttribute(name);
-  }
-
-  function attrNullNS() {
-    this.removeAttributeNS(name.space, name.local);
-  }
-
-  function attrConstant() {
-    this.setAttribute(name, value);
-  }
-
-  function attrConstantNS() {
-    this.setAttributeNS(name.space, name.local, value);
-  }
-
-  function attrFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.removeAttribute(name);
-    else this.setAttribute(name, x);
-  }
-
-  function attrFunctionNS() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.removeAttributeNS(name.space, name.local);
-    else this.setAttributeNS(name.space, name.local, x);
-  }
-
-  return this.each(value == null
-      ? (name.local ? attrNullNS : attrNull) : (typeof value === "function"
-      ? (name.local ? attrFunctionNS : attrFunction)
-      : (name.local ? attrConstantNS : attrConstant)));
-};
-d3_selectionPrototype.classed = function(name, value) {
-  var names = name.split(d3_selection_classedWhitespace),
-      n = names.length,
-      i = -1;
-  if (arguments.length > 1) {
-    while (++i < n) d3_selection_classed.call(this, names[i], value);
-    return this;
-  } else {
-    while (++i < n) if (!d3_selection_classed.call(this, names[i])) return false;
-    return true;
-  }
-};
-
-var d3_selection_classedWhitespace = /\s+/g;
-
-function d3_selection_classed(name, value) {
-  var re = new RegExp("(^|\\s+)" + d3.requote(name) + "(\\s+|$)", "g");
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) {
-    var node = this.node();
-    if (c = node.classList) return c.contains(name);
-    var c = node.className;
-    re.lastIndex = 0;
-    return re.test(c.baseVal != null ? c.baseVal : c);
-  }
-
-  function classedAdd() {
-    if (c = this.classList) return c.add(name);
-    var c = this.className,
-        cb = c.baseVal != null,
-        cv = cb ? c.baseVal : c;
-    re.lastIndex = 0;
-    if (!re.test(cv)) {
-      cv = d3_collapse(cv + " " + name);
-      if (cb) c.baseVal = cv;
-      else this.className = cv;
-    }
-  }
-
-  function classedRemove() {
-    if (c = this.classList) return c.remove(name);
-    var c = this.className,
-        cb = c.baseVal != null,
-        cv = cb ? c.baseVal : c;
-    cv = d3_collapse(cv.replace(re, " "));
-    if (cb) c.baseVal = cv;
-    else this.className = cv;
-  }
-
-  function classedFunction() {
-    (value.apply(this, arguments)
-        ? classedAdd
-        : classedRemove).call(this);
-  }
-
-  return this.each(typeof value === "function"
-      ? classedFunction : value
-      ? classedAdd
-      : classedRemove);
-}
-d3_selectionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = "";
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) return window
-      .getComputedStyle(this.node(), null)
-      .getPropertyValue(name);
-
-  function styleNull() {
-    this.style.removeProperty(name);
-  }
-
-  function styleConstant() {
-    this.style.setProperty(name, value, priority);
-  }
-
-  function styleFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.style.removeProperty(name);
-    else this.style.setProperty(name, x, priority);
-  }
-
-  return this.each(value == null
-      ? styleNull : (typeof value === "function"
-      ? styleFunction : styleConstant));
-};
-d3_selectionPrototype.property = function(name, value) {
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) return this.node()[name];
-
-  function propertyNull() {
-    delete this[name];
-  }
-
-  function propertyConstant() {
-    this[name] = value;
-  }
-
-  function propertyFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) delete this[name];
-    else this[name] = x;
-  }
-
-  return this.each(value == null
-      ? propertyNull : (typeof value === "function"
-      ? propertyFunction : propertyConstant));
-};
-d3_selectionPrototype.text = function(value) {
-  return arguments.length < 1
-      ? this.node().textContent : this.each(typeof value === "function"
-      ? function() { var v = value.apply(this, arguments); this.textContent = v == null ? "" : v; } : value == null
-      ? function() { this.textContent = ""; }
-      : function() { this.textContent = value; });
-};
-d3_selectionPrototype.html = function(value) {
-  return arguments.length < 1
-      ? this.node().innerHTML : this.each(typeof value === "function"
-      ? function() { var v = value.apply(this, arguments); this.innerHTML = v == null ? "" : v; } : value == null
-      ? function() { this.innerHTML = ""; }
-      : function() { this.innerHTML = value; });
-};
-// TODO append(node)?
-// TODO append(function)?
-d3_selectionPrototype.append = function(name) {
-  name = d3.ns.qualify(name);
-
-  function append() {
-    return this.appendChild(document.createElementNS(this.namespaceURI, name));
-  }
-
-  function appendNS() {
-    return this.appendChild(document.createElementNS(name.space, name.local));
-  }
-
-  return this.select(name.local ? appendNS : append);
-};
-// TODO insert(node, function)?
-// TODO insert(function, string)?
-// TODO insert(function, function)?
-d3_selectionPrototype.insert = function(name, before) {
-  name = d3.ns.qualify(name);
-
-  function insert() {
-    return this.insertBefore(
-        document.createElementNS(this.namespaceURI, name),
-        d3_select(before, this));
-  }
-
-  function insertNS() {
-    return this.insertBefore(
-        document.createElementNS(name.space, name.local),
-        d3_select(before, this));
-  }
-
-  return this.select(name.local ? insertNS : insert);
-};
-// TODO remove(selector)?
-// TODO remove(node)?
-// TODO remove(function)?
-d3_selectionPrototype.remove = function() {
-  return this.each(function() {
-    var parent = this.parentNode;
-    if (parent) parent.removeChild(this);
-  });
-};
-// TODO data(null) for clearing data?
-d3_selectionPrototype.data = function(data, join) {
-  var enter = [],
-      update = [],
-      exit = [];
-
-  function bind(group, groupData) {
-    var i,
-        n = group.length,
-        m = groupData.length,
-        n0 = Math.min(n, m),
-        n1 = Math.max(n, m),
-        updateNodes = [],
-        enterNodes = [],
-        exitNodes = [],
-        node,
-        nodeData;
-
-    if (join) {
-      var nodeByKey = {},
-          keys = [],
-          key,
-          j = groupData.length;
-
-      for (i = -1; ++i < n;) {
-        key = join.call(node = group[i], node.__data__, i);
-        if (key in nodeByKey) {
-          exitNodes[j++] = node; // duplicate key
-        } else {
-          nodeByKey[key] = node;
-        }
-        keys.push(key);
-      }
-
-      for (i = -1; ++i < m;) {
-        node = nodeByKey[key = join.call(groupData, nodeData = groupData[i], i)];
-        if (node) {
-          node.__data__ = nodeData;
-          updateNodes[i] = node;
-          enterNodes[i] = exitNodes[i] = null;
-        } else {
-          enterNodes[i] = d3_selection_dataNode(nodeData);
-          updateNodes[i] = exitNodes[i] = null;
-        }
-        delete nodeByKey[key];
-      }
-
-      for (i = -1; ++i < n;) {
-        if (keys[i] in nodeByKey) {
-          exitNodes[i] = group[i];
-        }
-      }
-    } else {
-      for (i = -1; ++i < n0;) {
-        node = group[i];
-        nodeData = groupData[i];
-        if (node) {
-          node.__data__ = nodeData;
-          updateNodes[i] = node;
-          enterNodes[i] = exitNodes[i] = null;
-        } else {
-          enterNodes[i] = d3_selection_dataNode(nodeData);
-          updateNodes[i] = exitNodes[i] = null;
-        }
-      }
-      for (; i < m; ++i) {
-        enterNodes[i] = d3_selection_dataNode(groupData[i]);
-        updateNodes[i] = exitNodes[i] = null;
-      }
-      for (; i < n1; ++i) {
-        exitNodes[i] = group[i];
-        enterNodes[i] = updateNodes[i] = null;
-      }
-    }
-
-    enterNodes.update
-        = updateNodes;
-
-    enterNodes.parentNode
-        = updateNodes.parentNode
-        = exitNodes.parentNode
-        = group.parentNode;
-
-    enter.push(enterNodes);
-    update.push(updateNodes);
-    exit.push(exitNodes);
-  }
-
-  var i = -1,
-      n = this.length,
-      group;
-  if (typeof data === "function") {
-    while (++i < n) {
-      bind(group = this[i], data.call(group, group.parentNode.__data__, i));
-    }
-  } else {
-    while (++i < n) {
-      bind(group = this[i], data);
-    }
-  }
-
-  var selection = d3_selection(update);
-  selection.enter = function() { return d3_selection_enter(enter); };
-  selection.exit = function() { return d3_selection(exit); };
-  return selection;
-};
-
-function d3_selection_dataNode(data) {
-  return {__data__: data};
-}
-d3_selectionPrototype.filter = function(filter) {
-  var subgroups = [],
-      subgroup,
-      group,
-      node;
-
-  if (typeof filter !== "function") filter = d3_selection_filter(filter);
-
-  for (var j = 0, m = this.length; j < m; j++) {
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = (group = this[j]).parentNode;
-    for (var i = 0, n = group.length; i < n; i++) {
-      if ((node = group[i]) && filter.call(node, node.__data__, i)) {
-        subgroup.push(node);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_filter(selector) {
-  return function() {
-    return d3_selectMatches(this, selector);
-  };
-}
-d3_selectionPrototype.map = function(map) {
-  return this.each(function() {
-    this.__data__ = map.apply(this, arguments);
-  });
-};
-d3_selectionPrototype.order = function() {
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
-      if (node = group[i]) {
-        if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
-        next = node;
-      }
-    }
-  }
-  return this;
-};
-d3_selectionPrototype.sort = function(comparator) {
-  comparator = d3_selection_sortComparator.apply(this, arguments);
-  for (var j = -1, m = this.length; ++j < m;) this[j].sort(comparator);
-  return this.order();
-};
-
-function d3_selection_sortComparator(comparator) {
-  if (!arguments.length) comparator = d3.ascending;
-  return function(a, b) {
-    return comparator(a && a.__data__, b && b.__data__);
-  };
-}
-// type can be namespaced, e.g., "click.foo"
-// listener can be null for removal
-d3_selectionPrototype.on = function(type, listener, capture) {
-  if (arguments.length < 3) capture = false;
-
-  // parse the type specifier
-  var name = "__on" + type, i = type.indexOf(".");
-  if (i > 0) type = type.substring(0, i);
-
-  // if called with only one argument, return the current listener
-  if (arguments.length < 2) return (i = this.node()[name]) && i._;
-
-  // remove the old event listener, and add the new event listener
-  return this.each(function(d, i) {
-    var node = this;
-
-    if (node[name]) node.removeEventListener(type, node[name], capture);
-    if (listener) node.addEventListener(type, node[name] = l, capture);
-
-    // wrapped event listener that preserves i
-    function l(e) {
-      var o = d3.event; // Events can be reentrant (e.g., focus).
-      d3.event = e;
-      try {
-        listener.call(node, node.__data__, i);
-      } finally {
-        d3.event = o;
-      }
-    }
-
-    // stash the unwrapped listener for retrieval
-    l._ = listener;
-  });
-};
-d3_selectionPrototype.each = function(callback) {
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      var node = group[i];
-      if (node) callback.call(node, node.__data__, i, j);
-    }
-  }
-  return this;
-};
-//
-// Note: assigning to the arguments array simultaneously changes the value of
-// the corresponding argument!
-//
-// TODO The `this` argument probably shouldn't be the first argument to the
-// callback, anyway, since it's redundant. However, that will require a major
-// version bump due to backwards compatibility, so I'm not changing it right
-// away.
-//
-d3_selectionPrototype.call = function(callback) {
-  callback.apply(this, (arguments[0] = this, arguments));
-  return this;
-};
-d3_selectionPrototype.empty = function() {
-  return !this.node();
-};
-d3_selectionPrototype.node = function(callback) {
-  for (var j = 0, m = this.length; j < m; j++) {
-    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
-      var node = group[i];
-      if (node) return node;
-    }
-  }
-  return null;
-};
-d3_selectionPrototype.transition = function() {
-  var subgroups = [],
-      subgroup,
-      node;
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      subgroup.push((node = group[i]) ? {node: node, delay: 0, duration: 250} : null);
-    }
-  }
-
-  return d3_transition(subgroups, d3_transitionInheritId || ++d3_transitionId, Date.now());
-};
-var d3_selectionRoot = d3_selection([[document]]);
-
-d3_selectionRoot[0].parentNode = d3_selectRoot;
-
-// TODO fast singleton implementation!
-// TODO select(function)
-d3.select = function(selector) {
-  return typeof selector === "string"
-      ? d3_selectionRoot.select(selector)
-      : d3_selection([[selector]]); // assume node
-};
-
-// TODO selectAll(function)
-d3.selectAll = function(selector) {
-  return typeof selector === "string"
-      ? d3_selectionRoot.selectAll(selector)
-      : d3_selection([d3_array(selector)]); // assume node[]
-};
-function d3_selection_enter(selection) {
-  d3_arraySubclass(selection, d3_selection_enterPrototype);
-  return selection;
-}
-
-var d3_selection_enterPrototype = [];
-
-d3_selection_enterPrototype.append = d3_selectionPrototype.append;
-d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;
-d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
-d3_selection_enterPrototype.node = d3_selectionPrototype.node;
-d3_selection_enterPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      upgroup,
-      group,
-      node;
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    upgroup = (group = this[j]).update;
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = group.parentNode;
-    for (var i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i));
-        subnode.__data__ = node.__data__;
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-function d3_transition(groups, id, time) {
-  d3_arraySubclass(groups, d3_transitionPrototype);
-
-  var tweens = {},
-      event = d3.dispatch("start", "end"),
-      ease = d3_transitionEase;
-
-  groups.id = id;
-
-  groups.time = time;
-
-  groups.tween = function(name, tween) {
-    if (arguments.length < 2) return tweens[name];
-    if (tween == null) delete tweens[name];
-    else tweens[name] = tween;
-    return groups;
-  };
-
-  groups.ease = function(value) {
-    if (!arguments.length) return ease;
-    ease = typeof value === "function" ? value : d3.ease.apply(d3, arguments);
-    return groups;
-  };
-
-  groups.each = function(type, listener) {
-    if (arguments.length < 2) return d3_transition_each.call(groups, type);
-    event.on(type, listener);
-    return groups;
-  };
-
-  d3.timer(function(elapsed) {
-    groups.each(function(d, i, j) {
-      var tweened = [],
-          node = this,
-          delay = groups[j][i].delay,
-          duration = groups[j][i].duration,
-          lock = node.__transition__ || (node.__transition__ = {active: 0, count: 0});
-
-      ++lock.count;
-
-      delay <= elapsed ? start(elapsed) : d3.timer(start, delay, time);
-
-      function start(elapsed) {
-        if (lock.active > id) return stop();
-        lock.active = id;
-
-        for (var tween in tweens) {
-          if (tween = tweens[tween].call(node, d, i)) {
-            tweened.push(tween);
-          }
-        }
-
-        event.start.call(node, d, i);
-        if (!tick(elapsed)) d3.timer(tick, 0, time);
-        return 1;
-      }
-
-      function tick(elapsed) {
-        if (lock.active !== id) return stop();
-
-        var t = (elapsed - delay) / duration,
-            e = ease(t),
-            n = tweened.length;
-
-        while (n > 0) {
-          tweened[--n].call(node, e);
-        }
-
-        if (t >= 1) {
-          stop();
-          d3_transitionInheritId = id;
-          event.end.call(node, d, i);
-          d3_transitionInheritId = 0;
-          return 1;
-        }
-      }
-
-      function stop() {
-        if (!--lock.count) delete node.__transition__;
-        return 1;
-      }
-    });
-    return 1;
-  }, 0, time);
-
-  return groups;
-}
-
-var d3_transitionRemove = {};
-
-function d3_transitionNull(d, i, a) {
-  return a != "" && d3_transitionRemove;
-}
-
-function d3_transitionTween(name, b) {
-  var interpolate = d3_interpolateByName(name);
-
-  function transitionFunction(d, i, a) {
-    var v = b.call(this, d, i);
-    return v == null
-        ? a != "" && d3_transitionRemove
-        : a != v && interpolate(a, v);
-  }
-
-  function transitionString(d, i, a) {
-    return a != b && interpolate(a, b);
-  }
-
-  return typeof b === "function" ? transitionFunction
-      : b == null ? d3_transitionNull
-      : (b += "", transitionString);
-}
-
-var d3_transitionPrototype = [],
-    d3_transitionId = 0,
-    d3_transitionInheritId = 0,
-    d3_transitionEase = d3.ease("cubic-in-out");
-
-d3_transitionPrototype.call = d3_selectionPrototype.call;
-
-d3.transition = function() {
-  return d3_selectionRoot.transition();
-};
-
-d3.transition.prototype = d3_transitionPrototype;
-d3_transitionPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selector(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if ((node = group[i]) && (subnode = selector.call(node.node, node.node.__data__, i))) {
-        if ("__data__" in node.node) subnode.__data__ = node.node.__data__;
-        subgroup.push({node: subnode, delay: node.delay, duration: node.duration});
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
-};
-d3_transitionPrototype.selectAll = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnodes,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subnodes = selector.call(node.node, node.node.__data__, i);
-        subgroups.push(subgroup = []);
-        for (var k = -1, o = subnodes.length; ++k < o;) {
-          subgroup.push({node: subnodes[k], delay: node.delay, duration: node.duration});
-        }
-      }
-    }
-  }
-
-  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
-};
-d3_transitionPrototype.attr = function(name, value) {
-  return this.attrTween(name, d3_transitionTween(name, value));
-};
-
-d3_transitionPrototype.attrTween = function(nameNS, tween) {
-  var name = d3.ns.qualify(nameNS);
-
-  function attrTween(d, i) {
-    var f = tween.call(this, d, i, this.getAttribute(name));
-    return f === d3_transitionRemove
-        ? (this.removeAttribute(name), null)
-        : f && function(t) { this.setAttribute(name, f(t)); };
-  }
-
-  function attrTweenNS(d, i) {
-    var f = tween.call(this, d, i, this.getAttributeNS(name.space, name.local));
-    return f === d3_transitionRemove
-        ? (this.removeAttributeNS(name.space, name.local), null)
-        : f && function(t) { this.setAttributeNS(name.space, name.local, f(t)); };
-  }
-
-  return this.tween("attr." + nameNS, name.local ? attrTweenNS : attrTween);
-};
-d3_transitionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = "";
-  return this.styleTween(name, d3_transitionTween(name, value), priority);
-};
-
-d3_transitionPrototype.styleTween = function(name, tween, priority) {
-  if (arguments.length < 3) priority = "";
-  return this.tween("style." + name, function(d, i) {
-    var f = tween.call(this, d, i, window.getComputedStyle(this, null).getPropertyValue(name));
-    return f === d3_transitionRemove
-        ? (this.style.removeProperty(name), null)
-        : f && function(t) { this.style.setProperty(name, f(t), priority); };
-  });
-};
-d3_transitionPrototype.text = function(value) {
-  return this.tween("text", function(d, i) {
-    this.textContent = typeof value === "function"
-        ? value.call(this, d, i)
-        : value;
-  });
-};
-d3_transitionPrototype.remove = function() {
-  return this.each("end", function() {
-    var p;
-    if (!this.__transition__ && (p = this.parentNode)) p.removeChild(this);
-  });
-};
-d3_transitionPrototype.delay = function(value) {
-  var groups = this;
-  return groups.each(typeof value === "function"
-      ? function(d, i, j) { groups[j][i].delay = +value.apply(this, arguments); }
-      : (value = +value, function(d, i, j) { groups[j][i].delay = value; }));
-};
-d3_transitionPrototype.duration = function(value) {
-  var groups = this;
-  return groups.each(typeof value === "function"
-      ? function(d, i, j) { groups[j][i].duration = +value.apply(this, arguments); }
-      : (value = +value, function(d, i, j) { groups[j][i].duration = value; }));
-};
-function d3_transition_each(callback) {
-  for (var j = 0, m = this.length; j < m; j++) {
-    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
-      var node = group[i];
-      if (node) callback.call(node = node.node, node.__data__, i, j);
-    }
-  }
-  return this;
-}
-d3_transitionPrototype.transition = function() {
-  return this.select(d3_this);
-};
-var d3_timer_queue = null,
-    d3_timer_interval, // is an interval (or frame) active?
-    d3_timer_timeout; // is a timeout active?
-
-// The timer will continue to fire until callback returns true.
-d3.timer = function(callback, delay, then) {
-  var found = false,
-      t0,
-      t1 = d3_timer_queue;
-
-  if (arguments.length < 3) {
-    if (arguments.length < 2) delay = 0;
-    else if (!isFinite(delay)) return;
-    then = Date.now();
-  }
-
-  // See if the callback's already in the queue.
-  while (t1) {
-    if (t1.callback === callback) {
-      t1.then = then;
-      t1.delay = delay;
-      found = true;
-      break;
-    }
-    t0 = t1;
-    t1 = t1.next;
-  }
-
-  // Otherwise, add the callback to the queue.
-  if (!found) d3_timer_queue = {
-    callback: callback,
-    then: then,
-    delay: delay,
-    next: d3_timer_queue
-  };
-
-  // Start animatin'!
-  if (!d3_timer_interval) {
-    d3_timer_timeout = clearTimeout(d3_timer_timeout);
-    d3_timer_interval = 1;
-    d3_timer_frame(d3_timer_step);
-  }
-}
-
-function d3_timer_step() {
-  var elapsed,
-      now = Date.now(),
-      t1 = d3_timer_queue;
-
-  while (t1) {
-    elapsed = now - t1.then;
-    if (elapsed >= t1.delay) t1.flush = t1.callback(elapsed);
-    t1 = t1.next;
-  }
-
-  var delay = d3_timer_flush() - now;
-  if (delay > 24) {
-    if (isFinite(delay)) {
-      clearTimeout(d3_timer_timeout);
-      d3_timer_timeout = setTimeout(d3_timer_step, delay);
-    }
-    d3_timer_interval = 0;
-  } else {
-    d3_timer_interval = 1;
-    d3_timer_frame(d3_timer_step);
-  }
-}
-
-d3.timer.flush = function() {
-  var elapsed,
-      now = Date.now(),
-      t1 = d3_timer_queue;
-
-  while (t1) {
-    elapsed = now - t1.then;
-    if (!t1.delay) t1.flush = t1.callback(elapsed);
-    t1 = t1.next;
-  }
-
-  d3_timer_flush();
-};
-
-// Flush after callbacks, to avoid concurrent queue modification.
-function d3_timer_flush() {
-  var t0 = null,
-      t1 = d3_timer_queue,
-      then = Infinity;
-  while (t1) {
-    if (t1.flush) {
-      t1 = t0 ? t0.next = t1.next : d3_timer_queue = t1.next;
-    } else {
-      then = Math.min(then, t1.then + t1.delay);
-      t1 = (t0 = t1).next;
-    }
-  }
-  return then;
-}
-
-var d3_timer_frame = window.requestAnimationFrame
-    || window.webkitRequestAnimationFrame
-    || window.mozRequestAnimationFrame
-    || window.oRequestAnimationFrame
-    || window.msRequestAnimationFrame
-    || function(callback) { setTimeout(callback, 17); };
-d3.transform = function(string) {
-  var g = document.createElementNS(d3.ns.prefix.svg, "g"),
-      identity = {a: 1, b: 0, c: 0, d: 1, e: 0, f: 0};
-  return (d3.transform = function(string) {
-    g.setAttribute("transform", string);
-    var t = g.transform.baseVal.consolidate();
-    return new d3_transform(t ? t.matrix : identity);
-  })(string);
-};
-
-// Compute x-scale and normalize the first row.
-// Compute shear and make second row orthogonal to first.
-// Compute y-scale and normalize the second row.
-// Finally, compute the rotation.
-function d3_transform(m) {
-  var r0 = [m.a, m.b],
-      r1 = [m.c, m.d],
-      kx = d3_transformNormalize(r0),
-      kz = d3_transformDot(r0, r1),
-      ky = d3_transformNormalize(d3_transformCombine(r1, r0, -kz)) || 0;
-  if (r0[0] * r1[1] < r1[0] * r0[1]) {
-    r0[0] *= -1;
-    r0[1] *= -1;
-    kx *= -1;
-    kz *= -1;
-  }
-  this.rotate = (kx ? Math.atan2(r0[1], r0[0]) : Math.atan2(-r1[0], r1[1])) * d3_transformDegrees;
-  this.translate = [m.e, m.f];
-  this.scale = [kx, ky];
-  this.skew = ky ? Math.atan2(kz, ky) * d3_transformDegrees : 0;
-};
-
-d3_transform.prototype.toString = function() {
-  return "translate(" + this.translate
-      + ")rotate(" + this.rotate
-      + ")skewX(" + this.skew
-      + ")scale(" + this.scale
-      + ")";
-};
-
-function d3_transformDot(a, b) {
-  return a[0] * b[0] + a[1] * b[1];
-}
-
-function d3_transformNormalize(a) {
-  var k = Math.sqrt(d3_transformDot(a, a));
-  if (k) {
-    a[0] /= k;
-    a[1] /= k;
-  }
-  return k;
-}
-
-function d3_transformCombine(a, b, k) {
-  a[0] += k * b[0];
-  a[1] += k * b[1];
-  return a;
-}
-
-var d3_transformDegrees = 180 / Math.PI;
-function d3_noop() {}
-d3.scale = {};
-
-function d3_scaleExtent(domain) {
-  var start = domain[0], stop = domain[domain.length - 1];
-  return start < stop ? [start, stop] : [stop, start];
-}
-
-function d3_scaleRange(scale) {
-  return scale.rangeExtent ? scale.rangeExtent() : d3_scaleExtent(scale.range());
-}
-function d3_scale_nice(domain, nice) {
-  var i0 = 0,
-      i1 = domain.length - 1,
-      x0 = domain[i0],
-      x1 = domain[i1],
-      dx;
-
-  if (x1 < x0) {
-    dx = i0; i0 = i1; i1 = dx;
-    dx = x0; x0 = x1; x1 = dx;
-  }
-
-  if (dx = x1 - x0) {
-    nice = nice(dx);
-    domain[i0] = nice.floor(x0);
-    domain[i1] = nice.ceil(x1);
-  }
-
-  return domain;
-}
-
-function d3_scale_niceDefault() {
-  return Math;
-}
-d3.scale.linear = function() {
-  return d3_scale_linear([0, 1], [0, 1], d3.interpolate, false);
-};
-
-function d3_scale_linear(domain, range, interpolate, clamp) {
-  var output,
-      input;
-
-  function rescale() {
-    var linear = domain.length == 2 ? d3_scale_bilinear : d3_scale_polylinear,
-        uninterpolate = clamp ? d3_uninterpolateClamp : d3_uninterpolateNumber;
-    output = linear(domain, range, uninterpolate, interpolate);
-    input = linear(range, domain, uninterpolate, d3.interpolate);
-    return scale;
-  }
-
-  function scale(x) {
-    return output(x);
-  }
-
-  // Note: requires range is coercible to number!
-  scale.invert = function(y) {
-    return input(y);
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = x.map(Number);
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.rangeRound = function(x) {
-    return scale.range(x).interpolate(d3.interpolateRound);
-  };
-
-  scale.clamp = function(x) {
-    if (!arguments.length) return clamp;
-    clamp = x;
-    return rescale();
-  };
-
-  scale.interpolate = function(x) {
-    if (!arguments.length) return interpolate;
-    interpolate = x;
-    return rescale();
-  };
-
-  scale.ticks = function(m) {
-    return d3_scale_linearTicks(domain, m);
-  };
-
-  scale.tickFormat = function(m) {
-    return d3_scale_linearTickFormat(domain, m);
-  };
-
-  scale.nice = function() {
-    d3_scale_nice(domain, d3_scale_linearNice);
-    return rescale();
-  };
-
-  scale.copy = function() {
-    return d3_scale_linear(domain, range, interpolate, clamp);
-  };
-
-  return rescale();
-};
-
-function d3_scale_linearRebind(scale, linear) {
-  return d3.rebind(scale, linear, "range", "rangeRound", "interpolate", "clamp");
-}
-
-function d3_scale_linearNice(dx) {
-  dx = Math.pow(10, Math.round(Math.log(dx) / Math.LN10) - 1);
-  return {
-    floor: function(x) { return Math.floor(x / dx) * dx; },
-    ceil: function(x) { return Math.ceil(x / dx) * dx; }
-  };
-}
-
-// TODO Dates? Ugh.
-function d3_scale_linearTickRange(domain, m) {
-  var extent = d3_scaleExtent(domain),
-      span = extent[1] - extent[0],
-      step = Math.pow(10, Math.floor(Math.log(span / m) / Math.LN10)),
-      err = m / span * step;
-
-  // Filter ticks to get closer to the desired count.
-  if (err <= .15) step *= 10;
-  else if (err <= .35) step *= 5;
-  else if (err <= .75) step *= 2;
-
-  // Round start and stop values to step interval.
-  extent[0] = Math.ceil(extent[0] / step) * step;
-  extent[1] = Math.floor(extent[1] / step) * step + step * .5; // inclusive
-  extent[2] = step;
-  return extent;
-}
-
-function d3_scale_linearTicks(domain, m) {
-  return d3.range.apply(d3, d3_scale_linearTickRange(domain, m));
-}
-
-function d3_scale_linearTickFormat(domain, m) {
-  return d3.format(",." + Math.max(0, -Math.floor(Math.log(d3_scale_linearTickRange(domain, m)[2]) / Math.LN10 + .01)) + "f");
-}
-function d3_scale_bilinear(domain, range, uninterpolate, interpolate) {
-  var u = uninterpolate(domain[0], domain[1]),
-      i = interpolate(range[0], range[1]);
-  return function(x) {
-    return i(u(x));
-  };
-}
-function d3_scale_polylinear(domain, range, uninterpolate, interpolate) {
-  var u = [],
-      i = [],
-      j = 0,
-      n = domain.length;
-
-  while (++j < n) {
-    u.push(uninterpolate(domain[j - 1], domain[j]));
-    i.push(interpolate(range[j - 1], range[j]));
-  }
-
-  return function(x) {
-    var j = d3.bisect(domain, x, 1, domain.length - 1) - 1;
-    return i[j](u[j](x));
-  };
-}
-d3.scale.log = function() {
-  return d3_scale_log(d3.scale.linear(), d3_scale_logp);
-};
-
-function d3_scale_log(linear, log) {
-  var pow = log.pow;
-
-  function scale(x) {
-    return linear(log(x));
-  }
-
-  scale.invert = function(x) {
-    return pow(linear.invert(x));
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return linear.domain().map(pow);
-    log = x[0] < 0 ? d3_scale_logn : d3_scale_logp;
-    pow = log.pow;
-    linear.domain(x.map(log));
-    return scale;
-  };
-
-  scale.nice = function() {
-    linear.domain(d3_scale_nice(linear.domain(), d3_scale_niceDefault));
-    return scale;
-  };
-
-  scale.ticks = function() {
-    var extent = d3_scaleExtent(linear.domain()),
-        ticks = [];
-    if (extent.every(isFinite)) {
-      var i = Math.floor(extent[0]),
-          j = Math.ceil(extent[1]),
-          u = pow(extent[0]),
-          v = pow(extent[1]);
-      if (log === d3_scale_logn) {
-        ticks.push(pow(i));
-        for (; i++ < j;) for (var k = 9; k > 0; k--) ticks.push(pow(i) * k);
-      } else {
-        for (; i < j; i++) for (var k = 1; k < 10; k++) ticks.push(pow(i) * k);
-        ticks.push(pow(i));
-      }
-      for (i = 0; ticks[i] < u; i++) {} // strip small values
-      for (j = ticks.length; ticks[j - 1] > v; j--) {} // strip big values
-      ticks = ticks.slice(i, j);
-    }
-    return ticks;
-  };
-
-  scale.tickFormat = function(n, format) {
-    if (arguments.length < 2) format = d3_scale_logFormat;
-    if (arguments.length < 1) return format;
-    var k = n / scale.ticks().length,
-        f = log === d3_scale_logn ? (e = -1e-12, Math.floor) : (e = 1e-12, Math.ceil),
-        e;
-    return function(d) {
-      return d / pow(f(log(d) + e)) < k ? format(d) : "";
-    };
-  };
-
-  scale.copy = function() {
-    return d3_scale_log(linear.copy(), log);
-  };
-
-  return d3_scale_linearRebind(scale, linear);
-};
-
-var d3_scale_logFormat = d3.format(".0e");
-
-function d3_scale_logp(x) {
-  return Math.log(x < 0 ? 0 : x) / Math.LN10;
-}
-
-function d3_scale_logn(x) {
-  return -Math.log(x > 0 ? 0 : -x) / Math.LN10;
-}
-
-d3_scale_logp.pow = function(x) {
-  return Math.pow(10, x);
-};
-
-d3_scale_logn.pow = function(x) {
-  return -Math.pow(10, -x);
-};
-d3.scale.pow = function() {
-  return d3_scale_pow(d3.scale.linear(), 1);
-};
-
-function d3_scale_pow(linear, exponent) {
-  var powp = d3_scale_powPow(exponent),
-      powb = d3_scale_powPow(1 / exponent);
-
-  function scale(x) {
-    return linear(powp(x));
-  }
-
-  scale.invert = function(x) {
-    return powb(linear.invert(x));
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return linear.domain().map(powb);
-    linear.domain(x.map(powp));
-    return scale;
-  };
-
-  scale.ticks = function(m) {
-    return d3_scale_linearTicks(scale.domain(), m);
-  };
-
-  scale.tickFormat = function(m) {
-    return d3_scale_linearTickFormat(scale.domain(), m);
-  };
-
-  scale.nice = function() {
-    return scale.domain(d3_scale_nice(scale.domain(), d3_scale_linearNice));
-  };
-
-  scale.exponent = function(x) {
-    if (!arguments.length) return exponent;
-    var domain = scale.domain();
-    powp = d3_scale_powPow(exponent = x);
-    powb = d3_scale_powPow(1 / exponent);
-    return scale.domain(domain);
-  };
-
-  scale.copy = function() {
-    return d3_scale_pow(linear.copy(), exponent);
-  };
-
-  return d3_scale_linearRebind(scale, linear);
-};
-
-function d3_scale_powPow(e) {
-  return function(x) {
-    return x < 0 ? -Math.pow(-x, e) : Math.pow(x, e);
-  };
-}
-d3.scale.sqrt = function() {
-  return d3.scale.pow().exponent(.5);
-};
-d3.scale.ordinal = function() {
-  return d3_scale_ordinal([], {t: "range", x: []});
-};
-
-function d3_scale_ordinal(domain, ranger) {
-  var index,
-      range,
-      rangeBand;
-
-  function scale(x) {
-    return range[((index[x] || (index[x] = domain.push(x))) - 1) % range.length];
-  }
-
-  function steps(start, step) {
-    return d3.range(domain.length).map(function(i) { return start + step * i; });
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = [];
-    index = {};
-    var i = -1, n = x.length, xi;
-    while (++i < n) if (!index[xi = x[i]]) index[xi] = domain.push(xi);
-    return scale[ranger.t](ranger.x, ranger.p);
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    rangeBand = 0;
-    ranger = {t: "range", x: x};
-    return scale;
-  };
-
-  scale.rangePoints = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var start = x[0],
-        stop = x[1],
-        step = (stop - start) / (domain.length - 1 + padding);
-    range = steps(domain.length < 2 ? (start + stop) / 2 : start + step * padding / 2, step);
-    rangeBand = 0;
-    ranger = {t: "rangePoints", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeBands = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var start = x[0],
-        stop = x[1],
-        step = (stop - start) / (domain.length + padding);
-    range = steps(start + step * padding, step);
-    rangeBand = step * (1 - padding);
-    ranger = {t: "rangeBands", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeRoundBands = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var start = x[0],
-        stop = x[1],
-        step = Math.floor((stop - start) / (domain.length + padding));
-    range = steps(start + Math.round((stop - start - (domain.length - padding) * step) / 2), step);
-    rangeBand = Math.round(step * (1 - padding));
-    ranger = {t: "rangeRoundBands", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeBand = function() {
-    return rangeBand;
-  };
-
-  scale.rangeExtent = function() {
-    return ranger.t === "range" ? d3_scaleExtent(ranger.x) : ranger.x;
-  };
-
-  scale.copy = function() {
-    return d3_scale_ordinal(domain, ranger);
-  };
-
-  return scale.domain(domain);
-};
-/*
- * This product includes color specifications and designs developed by Cynthia
- * Brewer (http://colorbrewer.org/). See lib/colorbrewer for more information.
- */
-
-d3.scale.category10 = function() {
-  return d3.scale.ordinal().range(d3_category10);
-};
-
-d3.scale.category20 = function() {
-  return d3.scale.ordinal().range(d3_category20);
-};
-
-d3.scale.category20b = function() {
-  return d3.scale.ordinal().range(d3_category20b);
-};
-
-d3.scale.category20c = function() {
-  return d3.scale.ordinal().range(d3_category20c);
-};
-
-var d3_category10 = [
-  "#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd",
-  "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"
-];
-
-var d3_category20 = [
-  "#1f77b4", "#aec7e8",
-  "#ff7f0e", "#ffbb78",
-  "#2ca02c", "#98df8a",
-  "#d62728", "#ff9896",
-  "#9467bd", "#c5b0d5",
-  "#8c564b", "#c49c94",
-  "#e377c2", "#f7b6d2",
-  "#7f7f7f", "#c7c7c7",
-  "#bcbd22", "#dbdb8d",
-  "#17becf", "#9edae5"
-];
-
-var d3_category20b = [
-  "#393b79", "#5254a3", "#6b6ecf", "#9c9ede",
-  "#637939", "#8ca252", "#b5cf6b", "#cedb9c",
-  "#8c6d31", "#bd9e39", "#e7ba52", "#e7cb94",
-  "#843c39", "#ad494a", "#d6616b", "#e7969c",
-  "#7b4173", "#a55194", "#ce6dbd", "#de9ed6"
-];
-
-var d3_category20c = [
-  "#3182bd", "#6baed6", "#9ecae1", "#c6dbef",
-  "#e6550d", "#fd8d3c", "#fdae6b", "#fdd0a2",
-  "#31a354", "#74c476", "#a1d99b", "#c7e9c0",
-  "#756bb1", "#9e9ac8", "#bcbddc", "#dadaeb",
-  "#636363", "#969696", "#bdbdbd", "#d9d9d9"
-];
-d3.scale.quantile = function() {
-  return d3_scale_quantile([], []);
-};
-
-function d3_scale_quantile(domain, range) {
-  var thresholds;
-
-  function rescale() {
-    var k = 0,
-        n = domain.length,
-        q = range.length;
-    thresholds = [];
-    while (++k < q) thresholds[k - 1] = d3.quantile(domain, k / q);
-    return scale;
-  }
-
-  function scale(x) {
-    if (isNaN(x = +x)) return NaN;
-    return range[d3.bisect(thresholds, x)];
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = x.filter(function(d) { return !isNaN(d); }).sort(d3.ascending);
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.quantiles = function() {
-    return thresholds;
-  };
-
-  scale.copy = function() {
-    return d3_scale_quantile(domain, range); // copy on write!
-  };
-
-  return rescale();
-};
-d3.scale.quantize = function() {
-  return d3_scale_quantize(0, 1, [0, 1]);
-};
-
-function d3_scale_quantize(x0, x1, range) {
-  var kx, i;
-
-  function scale(x) {
-    return range[Math.max(0, Math.min(i, Math.floor(kx * (x - x0))))];
-  }
-
-  function rescale() {
-    kx = range.length / (x1 - x0);
-    i = range.length - 1;
-    return scale;
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return [x0, x1];
-    x0 = +x[0];
-    x1 = +x[x.length - 1];
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.copy = function() {
-    return d3_scale_quantize(x0, x1, range); // copy on write
-  };
-
-  return rescale();
-};
-d3.svg = {};
-d3.svg.arc = function() {
-  var innerRadius = d3_svg_arcInnerRadius,
-      outerRadius = d3_svg_arcOuterRadius,
-      startAngle = d3_svg_arcStartAngle,
-      endAngle = d3_svg_arcEndAngle;
-
-  function arc() {
-    var r0 = innerRadius.apply(this, arguments),
-        r1 = outerRadius.apply(this, arguments),
-        a0 = startAngle.apply(this, arguments) + d3_svg_arcOffset,
-        a1 = endAngle.apply(this, arguments) + d3_svg_arcOffset,
-        da = (a1 < a0 && (da = a0, a0 = a1, a1 = da), a1 - a0),
-        df = da < Math.PI ? "0" : "1",
-        c0 = Math.cos(a0),
-        s0 = Math.sin(a0),
-        c1 = Math.cos(a1),
-        s1 = Math.sin(a1);
-    return da >= d3_svg_arcMax
-      ? (r0
-      ? "M0," + r1
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
-      + "M0," + r0
-      + "A" + r0 + "," + r0 + " 0 1,0 0," + (-r0)
-      + "A" + r0 + "," + r0 + " 0 1,0 0," + r0
-      + "Z"
-      : "M0," + r1
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
-      + "Z")
-      : (r0
-      ? "M" + r1 * c0 + "," + r1 * s0
-      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
-      + "L" + r0 * c1 + "," + r0 * s1
-      + "A" + r0 + "," + r0 + " 0 " + df + ",0 " + r0 * c0 + "," + r0 * s0
-      + "Z"
-      : "M" + r1 * c0 + "," + r1 * s0
-      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
-      + "L0,0"
-      + "Z");
-  }
-
-  arc.innerRadius = function(v) {
-    if (!arguments.length) return innerRadius;
-    innerRadius = d3.functor(v);
-    return arc;
-  };
-
-  arc.outerRadius = function(v) {
-    if (!arguments.length) return outerRadius;
-    outerRadius = d3.functor(v);
-    return arc;
-  };
-
-  arc.startAngle = function(v) {
-    if (!arguments.length) return startAngle;
-    startAngle = d3.functor(v);
-    return arc;
-  };
-
-  arc.endAngle = function(v) {
-    if (!arguments.length) return endAngle;
-    endAngle = d3.functor(v);
-    return arc;
-  };
-
-  arc.centroid = function() {
-    var r = (innerRadius.apply(this, arguments)
-        + outerRadius.apply(this, arguments)) / 2,
-        a = (startAngle.apply(this, arguments)
-        + endAngle.apply(this, arguments)) / 2 + d3_svg_arcOffset;
-    return [Math.cos(a) * r, Math.sin(a) * r];
-  };
-
-  return arc;
-};
-
-var d3_svg_arcOffset = -Math.PI / 2,
-    d3_svg_arcMax = 2 * Math.PI - 1e-6;
-
-function d3_svg_arcInnerRadius(d) {
-  return d.innerRadius;
-}
-
-function d3_svg_arcOuterRadius(d) {
-  return d.outerRadius;
-}
-
-function d3_svg_arcStartAngle(d) {
-  return d.startAngle;
-}
-
-function d3_svg_arcEndAngle(d) {
-  return d.endAngle;
-}
-function d3_svg_line(projection) {
-  var x = d3_svg_lineX,
-      y = d3_svg_lineY,
-      interpolate = "linear",
-      interpolator = d3_svg_lineInterpolators[interpolate],
-      tension = .7;
-
-  function line(d) {
-    return d.length < 1 ? null : "M" + interpolator(projection(d3_svg_linePoints(this, d, x, y)), tension);
-  }
-
-  line.x = function(v) {
-    if (!arguments.length) return x;
-    x = v;
-    return line;
-  };
-
-  line.y = function(v) {
-    if (!arguments.length) return y;
-    y = v;
-    return line;
-  };
-
-  line.interpolate = function(v) {
-    if (!arguments.length) return interpolate;
-    interpolator = d3_svg_lineInterpolators[interpolate = v];
-    return line;
-  };
-
-  line.tension = function(v) {
-    if (!arguments.length) return tension;
-    tension = v;
-    return line;
-  };
-
-  return line;
-}
-
-d3.svg.line = function() {
-  return d3_svg_line(Object);
-};
-
-// Converts the specified array of data into an array of points
-// (x-y tuples), by evaluating the specified `x` and `y` functions on each
-// data point. The `this` context of the evaluated functions is the specified
-// "self" object; each function is passed the current datum and index.
-function d3_svg_linePoints(self, d, x, y) {
-  var points = [],
-      i = -1,
-      n = d.length,
-      fx = typeof x === "function",
-      fy = typeof y === "function",
-      value;
-  if (fx && fy) {
-    while (++i < n) points.push([
-      x.call(self, value = d[i], i),
-      y.call(self, value, i)
-    ]);
-  } else if (fx) {
-    while (++i < n) points.push([x.call(self, d[i], i), y]);
-  } else if (fy) {
-    while (++i < n) points.push([x, y.call(self, d[i], i)]);
-  } else {
-    while (++i < n) points.push([x, y]);
-  }
-  return points;
-}
-
-// The default `x` property, which references d[0].
-function d3_svg_lineX(d) {
-  return d[0];
-}
-
-// The default `y` property, which references d[1].
-function d3_svg_lineY(d) {
-  return d[1];
-}
-
-// The various interpolators supported by the `line` class.
-var d3_svg_lineInterpolators = {
-  "linear": d3_svg_lineLinear,
-  "step-before": d3_svg_lineStepBefore,
-  "step-after": d3_svg_lineStepAfter,
-  "basis": d3_svg_lineBasis,
-  "basis-open": d3_svg_lineBasisOpen,
-  "basis-closed": d3_svg_lineBasisClosed,
-  "bundle": d3_svg_lineBundle,
-  "cardinal": d3_svg_lineCardinal,
-  "cardinal-open": d3_svg_lineCardinalOpen,
-  "cardinal-closed": d3_svg_lineCardinalClosed,
-  "monotone": d3_svg_lineMonotone
-};
-
-// Linear interpolation; generates "L" commands.
-function d3_svg_lineLinear(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("L", (p = points[i])[0], ",", p[1]);
-  return path.join("");
-}
-
-// Step interpolation; generates "H" and "V" commands.
-function d3_svg_lineStepBefore(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("V", (p = points[i])[1], "H", p[0]);
-  return path.join("");
-}
-
-// Step interpolation; generates "H" and "V" commands.
-function d3_svg_lineStepAfter(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("H", (p = points[i])[0], "V", p[1]);
-  return path.join("");
-}
-
-// Open cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinalOpen(points, tension) {
-  return points.length < 4
-      ? d3_svg_lineLinear(points)
-      : points[1] + d3_svg_lineHermite(points.slice(1, points.length - 1),
-        d3_svg_lineCardinalTangents(points, tension));
-}
-
-// Closed cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinalClosed(points, tension) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] + d3_svg_lineHermite((points.push(points[0]), points),
-        d3_svg_lineCardinalTangents([points[points.length - 2]]
-        .concat(points, [points[1]]), tension));
-}
-
-// Cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinal(points, tension, closed) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] + d3_svg_lineHermite(points,
-        d3_svg_lineCardinalTangents(points, tension));
-}
-
-// Hermite spline construction; generates "C" commands.
-function d3_svg_lineHermite(points, tangents) {
-  if (tangents.length < 1
-      || (points.length != tangents.length
-      && points.length != tangents.length + 2)) {
-    return d3_svg_lineLinear(points);
-  }
-
-  var quad = points.length != tangents.length,
-      path = "",
-      p0 = points[0],
-      p = points[1],
-      t0 = tangents[0],
-      t = t0,
-      pi = 1;
-
-  if (quad) {
-    path += "Q" + (p[0] - t0[0] * 2 / 3) + "," + (p[1] - t0[1] * 2 / 3)
-        + "," + p[0] + "," + p[1];
-    p0 = points[1];
-    pi = 2;
-  }
-
-  if (tangents.length > 1) {
-    t = tangents[1];
-    p = points[pi];
-    pi++;
-    path += "C" + (p0[0] + t0[0]) + "," + (p0[1] + t0[1])
-        + "," + (p[0] - t[0]) + "," + (p[1] - t[1])
-        + "," + p[0] + "," + p[1];
-    for (var i = 2; i < tangents.length; i++, pi++) {
-      p = points[pi];
-      t = tangents[i];
-      path += "S" + (p[0] - t[0]) + "," + (p[1] - t[1])
-          + "," + p[0] + "," + p[1];
-    }
-  }
-
-  if (quad) {
-    var lp = points[pi];
-    path += "Q" + (p[0] + t[0] * 2 / 3) + "," + (p[1] + t[1] * 2 / 3)
-        + "," + lp[0] + "," + lp[1];
-  }
-
-  return path;
-}
-
-// Generates tangents for a cardinal spline.
-function d3_svg_lineCardinalTangents(points, tension) {
-  var tangents = [],
-      a = (1 - tension) / 2,
-      p0,
-      p1 = points[0],
-      p2 = points[1],
-      i = 1,
-      n = points.length;
-  while (++i < n) {
-    p0 = p1;
-    p1 = p2;
-    p2 = points[i];
-    tangents.push([a * (p2[0] - p0[0]), a * (p2[1] - p0[1])]);
-  }
-  return tangents;
-}
-
-// B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasis(points) {
-  if (points.length < 3) return d3_svg_lineLinear(points);
-  var i = 1,
-      n = points.length,
-      pi = points[0],
-      x0 = pi[0],
-      y0 = pi[1],
-      px = [x0, x0, x0, (pi = points[1])[0]],
-      py = [y0, y0, y0, pi[1]],
-      path = [x0, ",", y0];
-  d3_svg_lineBasisBezier(path, px, py);
-  while (++i < n) {
-    pi = points[i];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  i = -1;
-  while (++i < 2) {
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-// Open B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasisOpen(points) {
-  if (points.length < 4) return d3_svg_lineLinear(points);
-  var path = [],
-      i = -1,
-      n = points.length,
-      pi,
-      px = [0],
-      py = [0];
-  while (++i < 3) {
-    pi = points[i];
-    px.push(pi[0]);
-    py.push(pi[1]);
-  }
-  path.push(d3_svg_lineDot4(d3_svg_lineBasisBezier3, px)
-    + "," + d3_svg_lineDot4(d3_svg_lineBasisBezier3, py));
-  --i; while (++i < n) {
-    pi = points[i];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-// Closed B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasisClosed(points) {
-  var path,
-      i = -1,
-      n = points.length,
-      m = n + 4,
-      pi,
-      px = [],
-      py = [];
-  while (++i < 4) {
-    pi = points[i % n];
-    px.push(pi[0]);
-    py.push(pi[1]);
-  }
-  path = [
-    d3_svg_lineDot4(d3_svg_lineBasisBezier3, px), ",",
-    d3_svg_lineDot4(d3_svg_lineBasisBezier3, py)
-  ];
-  --i; while (++i < m) {
-    pi = points[i % n];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-function d3_svg_lineBundle(points, tension) {
-  var n = points.length - 1,
-      x0 = points[0][0],
-      y0 = points[0][1],
-      dx = points[n][0] - x0,
-      dy = points[n][1] - y0,
-      i = -1,
-      p,
-      t;
-  while (++i <= n) {
-    p = points[i];
-    t = i / n;
-    p[0] = tension * p[0] + (1 - tension) * (x0 + t * dx);
-    p[1] = tension * p[1] + (1 - tension) * (y0 + t * dy);
-  }
-  return d3_svg_lineBasis(points);
-}
-
-// Returns the dot product of the given four-element vectors.
-function d3_svg_lineDot4(a, b) {
-  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
-}
-
-// Matrix to transform basis (b-spline) control points to bezier
-// control points. Derived from FvD 11.2.8.
-var d3_svg_lineBasisBezier1 = [0, 2/3, 1/3, 0],
-    d3_svg_lineBasisBezier2 = [0, 1/3, 2/3, 0],
-    d3_svg_lineBasisBezier3 = [0, 1/6, 2/3, 1/6];
-
-// Pushes a "C" Bézier curve onto the specified path array, given the
-// two specified four-element arrays which define the control points.
-function d3_svg_lineBasisBezier(path, x, y) {
-  path.push(
-      "C", d3_svg_lineDot4(d3_svg_lineBasisBezier1, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier1, y),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, y),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, y));
-}
-
-// Computes the slope from points p0 to p1.
-function d3_svg_lineSlope(p0, p1) {
-  return (p1[1] - p0[1]) / (p1[0] - p0[0]);
-}
-
-// Compute three-point differences for the given points.
-// http://en.wikipedia.org/wiki/Cubic_Hermite_spline#Finite_difference
-function d3_svg_lineFiniteDifferences(points) {
-  var i = 0,
-      j = points.length - 1,
-      m = [],
-      p0 = points[0],
-      p1 = points[1],
-      d = m[0] = d3_svg_lineSlope(p0, p1);
-  while (++i < j) {
-    m[i] = d + (d = d3_svg_lineSlope(p0 = p1, p1 = points[i + 1]));
-  }
-  m[i] = d;
-  return m;
-}
-
-// Interpolates the given points using Fritsch-Carlson Monotone cubic Hermite
-// interpolation. Returns an array of tangent vectors. For details, see
-// http://en.wikipedia.org/wiki/Monotone_cubic_interpolation
-function d3_svg_lineMonotoneTangents(points) {
-  var tangents = [],
-      d,
-      a,
-      b,
-      s,
-      m = d3_svg_lineFiniteDifferences(points),
-      i = -1,
-      j = points.length - 1;
-
-  // The first two steps are done by computing finite-differences:
-  // 1. Compute the slopes of the secant lines between successive points.
-  // 2. Initialize the tangents at every point as the average of the secants.
-
-  // Then, for each segment…
-  while (++i < j) {
-    d = d3_svg_lineSlope(points[i], points[i + 1]);
-
-    // 3. If two successive yk = y{k + 1} are equal (i.e., d is zero), then set
-    // mk = m{k + 1} = 0 as the spline connecting these points must be flat to
-    // preserve monotonicity. Ignore step 4 and 5 for those k.
-
-    if (Math.abs(d) < 1e-6) {
-      m[i] = m[i + 1] = 0;
-    } else {
-      // 4. Let ak = mk / dk and bk = m{k + 1} / dk.
-      a = m[i] / d;
-      b = m[i + 1] / d;
-
-      // 5. Prevent overshoot and ensure monotonicity by restricting the
-      // magnitude of vector <ak, bk> to a circle of radius 3.
-      s = a * a + b * b;
-      if (s > 9) {
-        s = d * 3 / Math.sqrt(s);
-        m[i] = s * a;
-        m[i + 1] = s * b;
-      }
-    }
-  }
-
-  // Compute the normalized tangent vector from the slopes. Note that if x is
-  // not monotonic, it's possible that the slope will be infinite, so we protect
-  // against NaN by setting the coordinate to zero.
-  i = -1; while (++i <= j) {
-    s = (points[Math.min(j, i + 1)][0] - points[Math.max(0, i - 1)][0])
-      / (6 * (1 + m[i] * m[i]));
-    tangents.push([s || 0, m[i] * s || 0]);
-  }
-
-  return tangents;
-}
-
-function d3_svg_lineMonotone(points) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] +
-        d3_svg_lineHermite(points, d3_svg_lineMonotoneTangents(points));
-}
-d3.svg.line.radial = function() {
-  var line = d3_svg_line(d3_svg_lineRadial);
-  line.radius = line.x, delete line.x;
-  line.angle = line.y, delete line.y;
-  return line;
-};
-
-function d3_svg_lineRadial(points) {
-  var point,
-      i = -1,
-      n = points.length,
-      r,
-      a;
-  while (++i < n) {
-    point = points[i];
-    r = point[0];
-    a = point[1] + d3_svg_arcOffset;
-    point[0] = r * Math.cos(a);
-    point[1] = r * Math.sin(a);
-  }
-  return points;
-}
-function d3_svg_area(projection) {
-  var x0 = d3_svg_lineX,
-      x1 = d3_svg_lineX,
-      y0 = 0,
-      y1 = d3_svg_lineY,
-      interpolate,
-      i0,
-      i1,
-      tension = .7;
-
-  function area(d) {
-    if (d.length < 1) return null;
-    var points0 = d3_svg_linePoints(this, d, x0, y0),
-        points1 = d3_svg_linePoints(this, d, x0 === x1 ? d3_svg_areaX(points0) : x1, y0 === y1 ? d3_svg_areaY(points0) : y1);
-    return "M" + i0(projection(points1), tension)
-         + "L" + i1(projection(points0.reverse()), tension)
-         + "Z";
-  }
-
-  area.x = function(x) {
-    if (!arguments.length) return x1;
-    x0 = x1 = x;
-    return area;
-  };
-
-  area.x0 = function(x) {
-    if (!arguments.length) return x0;
-    x0 = x;
-    return area;
-  };
-
-  area.x1 = function(x) {
-    if (!arguments.length) return x1;
-    x1 = x;
-    return area;
-  };
-
-  area.y = function(y) {
-    if (!arguments.length) return y1;
-    y0 = y1 = y;
-    return area;
-  };
-
-  area.y0 = function(y) {
-    if (!arguments.length) return y0;
-    y0 = y;
-    return area;
-  };
-
-  area.y1 = function(y) {
-    if (!arguments.length) return y1;
-    y1 = y;
-    return area;
-  };
-
-  area.interpolate = function(x) {
-    if (!arguments.length) return interpolate;
-    i0 = d3_svg_lineInterpolators[interpolate = x];
-    i1 = i0.reverse || i0;
-    return area;
-  };
-
-  area.tension = function(x) {
-    if (!arguments.length) return tension;
-    tension = x;
-    return area;
-  };
-
-  return area.interpolate("linear");
-}
-
-d3_svg_lineStepBefore.reverse = d3_svg_lineStepAfter;
-d3_svg_lineStepAfter.reverse = d3_svg_lineStepBefore;
-
-d3.svg.area = function() {
-  return d3_svg_area(Object);
-};
-
-function d3_svg_areaX(points) {
-  return function(d, i) {
-    return points[i][0];
-  };
-}
-
-function d3_svg_areaY(points) {
-  return function(d, i) {
-    return points[i][1];
-  };
-}
-d3.svg.area.radial = function() {
-  var area = d3_svg_area(d3_svg_lineRadial);
-  area.radius = area.x, delete area.x;
-  area.innerRadius = area.x0, delete area.x0;
-  area.outerRadius = area.x1, delete area.x1;
-  area.angle = area.y, delete area.y;
-  area.startAngle = area.y0, delete area.y0;
-  area.endAngle = area.y1, delete area.y1;
-  return area;
-};
-d3.svg.chord = function() {
-  var source = d3_svg_chordSource,
-      target = d3_svg_chordTarget,
-      radius = d3_svg_chordRadius,
-      startAngle = d3_svg_arcStartAngle,
-      endAngle = d3_svg_arcEndAngle;
-
-  // TODO Allow control point to be customized.
-
-  function chord(d, i) {
-    var s = subgroup(this, source, d, i),
-        t = subgroup(this, target, d, i);
-    return "M" + s.p0
-      + arc(s.r, s.p1, s.a1 - s.a0) + (equals(s, t)
-      ? curve(s.r, s.p1, s.r, s.p0)
-      : curve(s.r, s.p1, t.r, t.p0)
-      + arc(t.r, t.p1, t.a1 - t.a0)
-      + curve(t.r, t.p1, s.r, s.p0))
-      + "Z";
-  }
-
-  function subgroup(self, f, d, i) {
-    var subgroup = f.call(self, d, i),
-        r = radius.call(self, subgroup, i),
-        a0 = startAngle.call(self, subgroup, i) + d3_svg_arcOffset,
-        a1 = endAngle.call(self, subgroup, i) + d3_svg_arcOffset;
-    return {
-      r: r,
-      a0: a0,
-      a1: a1,
-      p0: [r * Math.cos(a0), r * Math.sin(a0)],
-      p1: [r * Math.cos(a1), r * Math.sin(a1)]
-    };
-  }
-
-  function equals(a, b) {
-    return a.a0 == b.a0 && a.a1 == b.a1;
-  }
-
-  function arc(r, p, a) {
-    return "A" + r + "," + r + " 0 " + +(a > Math.PI) + ",1 " + p;
-  }
-
-  function curve(r0, p0, r1, p1) {
-    return "Q 0,0 " + p1;
-  }
-
-  chord.radius = function(v) {
-    if (!arguments.length) return radius;
-    radius = d3.functor(v);
-    return chord;
-  };
-
-  chord.source = function(v) {
-    if (!arguments.length) return source;
-    source = d3.functor(v);
-    return chord;
-  };
-
-  chord.target = function(v) {
-    if (!arguments.length) return target;
-    target = d3.functor(v);
-    return chord;
-  };
-
-  chord.startAngle = function(v) {
-    if (!arguments.length) return startAngle;
-    startAngle = d3.functor(v);
-    return chord;
-  };
-
-  chord.endAngle = function(v) {
-    if (!arguments.length) return endAngle;
-    endAngle = d3.functor(v);
-    return chord;
-  };
-
-  return chord;
-};
-
-function d3_svg_chordSource(d) {
-  return d.source;
-}
-
-function d3_svg_chordTarget(d) {
-  return d.target;
-}
-
-function d3_svg_chordRadius(d) {
-  return d.radius;
-}
-
-function d3_svg_chordStartAngle(d) {
-  return d.startAngle;
-}
-
-function d3_svg_chordEndAngle(d) {
-  return d.endAngle;
-}
-d3.svg.diagonal = function() {
-  var source = d3_svg_chordSource,
-      target = d3_svg_chordTarget,
-      projection = d3_svg_diagonalProjection;
-
-  function diagonal(d, i) {
-    var p0 = source.call(this, d, i),
-        p3 = target.call(this, d, i),
-        m = (p0.y + p3.y) / 2,
-        p = [p0, {x: p0.x, y: m}, {x: p3.x, y: m}, p3];
-    p = p.map(projection);
-    return "M" + p[0] + "C" + p[1] + " " + p[2] + " " + p[3];
-  }
-
-  diagonal.source = function(x) {
-    if (!arguments.length) return source;
-    source = d3.functor(x);
-    return diagonal;
-  };
-
-  diagonal.target = function(x) {
-    if (!arguments.length) return target;
-    target = d3.functor(x);
-    return diagonal;
-  };
-
-  diagonal.projection = function(x) {
-    if (!arguments.length) return projection;
-    projection = x;
-    return diagonal;
-  };
-
-  return diagonal;
-};
-
-function d3_svg_diagonalProjection(d) {
-  return [d.x, d.y];
-}
-d3.svg.diagonal.radial = function() {
-  var diagonal = d3.svg.diagonal(),
-      projection = d3_svg_diagonalProjection,
-      projection_ = diagonal.projection;
-
-  diagonal.projection = function(x) {
-    return arguments.length
-        ? projection_(d3_svg_diagonalRadialProjection(projection = x))
-        : projection;
-  };
-
-  return diagonal;
-};
-
-function d3_svg_diagonalRadialProjection(projection) {
-  return function() {
-    var d = projection.apply(this, arguments),
-        r = d[0],
-        a = d[1] + d3_svg_arcOffset;
-    return [r * Math.cos(a), r * Math.sin(a)];
-  };
-}
-d3.svg.mouse = function(container) {
-  return d3_svg_mousePoint(container, d3.event);
-};
-
-// https://bugs.webkit.org/show_bug.cgi?id=44083
-var d3_mouse_bug44083 = /WebKit/.test(navigator.userAgent) ? -1 : 0;
-
-function d3_svg_mousePoint(container, e) {
-  var point = (container.ownerSVGElement || container).createSVGPoint();
-  if ((d3_mouse_bug44083 < 0) && (window.scrollX || window.scrollY)) {
-    var svg = d3.select(document.body)
-      .append("svg")
-        .style("position", "absolute")
-        .style("top", 0)
-        .style("left", 0);
-    var ctm = svg[0][0].getScreenCTM();
-    d3_mouse_bug44083 = !(ctm.f || ctm.e);
-    svg.remove();
-  }
-  if (d3_mouse_bug44083) {
-    point.x = e.pageX;
-    point.y = e.pageY;
-  } else {
-    point.x = e.clientX;
-    point.y = e.clientY;
-  }
-  point = point.matrixTransform(container.getScreenCTM().inverse());
-  return [point.x, point.y];
-};
-d3.svg.touches = function(container, touches) {
-  if (arguments.length < 2) touches = d3.event.touches;
-
-  return touches ? d3_array(touches).map(function(touch) {
-    var point = d3_svg_mousePoint(container, touch);
-    point.identifier = touch.identifier;
-    return point;
-  }) : [];
-};
-d3.svg.symbol = function() {
-  var type = d3_svg_symbolType,
-      size = d3_svg_symbolSize;
-
-  function symbol(d, i) {
-    return (d3_svg_symbols[type.call(this, d, i)]
-        || d3_svg_symbols.circle)
-        (size.call(this, d, i));
-  }
-
-  symbol.type = function(x) {
-    if (!arguments.length) return type;
-    type = d3.functor(x);
-    return symbol;
-  };
-
-  // size of symbol in square pixels
-  symbol.size = function(x) {
-    if (!arguments.length) return size;
-    size = d3.functor(x);
-    return symbol;
-  };
-
-  return symbol;
-};
-
-function d3_svg_symbolSize() {
-  return 64;
-}
-
-function d3_svg_symbolType() {
-  return "circle";
-}
-
-// TODO cross-diagonal?
-var d3_svg_symbols = {
-  "circle": function(size) {
-    var r = Math.sqrt(size / Math.PI);
-    return "M0," + r
-        + "A" + r + "," + r + " 0 1,1 0," + (-r)
-        + "A" + r + "," + r + " 0 1,1 0," + r
-        + "Z";
-  },
-  "cross": function(size) {
-    var r = Math.sqrt(size / 5) / 2;
-    return "M" + -3 * r + "," + -r
-        + "H" + -r
-        + "V" + -3 * r
-        + "H" + r
-        + "V" + -r
-        + "H" + 3 * r
-        + "V" + r
-        + "H" + r
-        + "V" + 3 * r
-        + "H" + -r
-        + "V" + r
-        + "H" + -3 * r
-        + "Z";
-  },
-  "diamond": function(size) {
-    var ry = Math.sqrt(size / (2 * d3_svg_symbolTan30)),
-        rx = ry * d3_svg_symbolTan30;
-    return "M0," + -ry
-        + "L" + rx + ",0"
-        + " 0," + ry
-        + " " + -rx + ",0"
-        + "Z";
-  },
-  "square": function(size) {
-    var r = Math.sqrt(size) / 2;
-    return "M" + -r + "," + -r
-        + "L" + r + "," + -r
-        + " " + r + "," + r
-        + " " + -r + "," + r
-        + "Z";
-  },
-  "triangle-down": function(size) {
-    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
-        ry = rx * d3_svg_symbolSqrt3 / 2;
-    return "M0," + ry
-        + "L" + rx +"," + -ry
-        + " " + -rx + "," + -ry
-        + "Z";
-  },
-  "triangle-up": function(size) {
-    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
-        ry = rx * d3_svg_symbolSqrt3 / 2;
-    return "M0," + -ry
-        + "L" + rx +"," + ry
-        + " " + -rx + "," + ry
-        + "Z";
-  }
-};
-
-d3.svg.symbolTypes = d3.keys(d3_svg_symbols);
-
-var d3_svg_symbolSqrt3 = Math.sqrt(3),
-    d3_svg_symbolTan30 = Math.tan(30 * Math.PI / 180);
-d3.svg.axis = function() {
-  var scale = d3.scale.linear(),
-      orient = "bottom",
-      tickMajorSize = 6,
-      tickMinorSize = 6,
-      tickEndSize = 6,
-      tickPadding = 3,
-      tickArguments_ = [10],
-      tickFormat_,
-      tickSubdivide = 0;
-
-  function axis(selection) {
-    selection.each(function(d, i, j) {
-      var g = d3.select(this);
-
-      // If selection is a transition, create subtransitions.
-      var transition = selection.delay ? function(o) {
-        var id = d3_transitionInheritId;
-        try {
-          d3_transitionInheritId = selection.id;
-          return o.transition()
-              .delay(selection[j][i].delay)
-              .duration(selection[j][i].duration)
-              .ease(selection.ease());
-        } finally {
-          d3_transitionInheritId = id;
-        }
-      } : Object;
-
-      // Ticks, or domain values for ordinal scales.
-      var ticks = scale.ticks ? scale.ticks.apply(scale, tickArguments_) : scale.domain(),
-          tickFormat = tickFormat_ == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments_) : String) : tickFormat_;
-
-      // Minor ticks.
-      var subticks = d3_svg_axisSubdivide(scale, ticks, tickSubdivide),
-          subtick = g.selectAll(".minor").data(subticks, String),
-          subtickEnter = subtick.enter().insert("line", "g").attr("class", "tick minor").style("opacity", 1e-6),
-          subtickExit = transition(subtick.exit()).style("opacity", 1e-6).remove(),
-          subtickUpdate = transition(subtick).style("opacity", 1);
-
-      // Major ticks.
-      var tick = g.selectAll("g").data(ticks, String),
-          tickEnter = tick.enter().insert("g", "path").style("opacity", 1e-6),
-          tickExit = transition(tick.exit()).style("opacity", 1e-6).remove(),
-          tickUpdate = transition(tick).style("opacity", 1),
-          tickTransform;
-
-      // Domain.
-      var range = d3_scaleRange(scale),
-          path = g.selectAll(".domain").data([0]),
-          pathEnter = path.enter().append("path").attr("class", "domain"),
-          pathUpdate = transition(path);
-
-      // Stash a snapshot of the new scale, and retrieve the old snapshot.
-      var scale1 = scale.copy(),
-          scale0 = this.__chart__ || scale1;
-      this.__chart__ = scale1;
-
-      tickEnter.append("line").attr("class", "tick");
-      tickEnter.append("text");
-      tickUpdate.select("text").text(tickFormat);
-
-      switch (orient) {
-        case "bottom": {
-          tickTransform = d3_svg_axisX;
-          subtickEnter.attr("y2", tickMinorSize);
-          subtickUpdate.attr("x2", 0).attr("y2", tickMinorSize);
-          tickEnter.select("line").attr("y2", tickMajorSize);
-          tickEnter.select("text").attr("y", Math.max(tickMajorSize, 0) + tickPadding);
-          tickUpdate.select("line").attr("x2", 0).attr("y2", tickMajorSize);
-          tickUpdate.select("text").attr("x", 0).attr("y", Math.max(tickMajorSize, 0) + tickPadding).attr("dy", ".71em").attr("text-anchor", "middle");
-          pathUpdate.attr("d", "M" + range[0] + "," + tickEndSize + "V0H" + range[1] + "V" + tickEndSize);
-          break;
-        }
-        case "top": {
-          tickTransform = d3_svg_axisX;
-          subtickEnter.attr("y2", -tickMinorSize);
-          subtickUpdate.attr("x2", 0).attr("y2", -tickMinorSize);
-          tickEnter.select("line").attr("y2", -tickMajorSize);
-          tickEnter.select("text").attr("y", -(Math.max(tickMajorSize, 0) + tickPadding));
-          tickUpdate.select("line").attr("x2", 0).attr("y2", -tickMajorSize);
-          tickUpdate.select("text").attr("x", 0).attr("y", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("dy", "0em").attr("text-anchor", "middle");
-          pathUpdate.attr("d", "M" + range[0] + "," + -tickEndSize + "V0H" + range[1] + "V" + -tickEndSize);
-          break;
-        }
-        case "left": {
-          tickTransform = d3_svg_axisY;
-          subtickEnter.attr("x2", -tickMinorSize);
-          subtickUpdate.attr("x2", -tickMinorSize).attr("y2", 0);
-          tickEnter.select("line").attr("x2", -tickMajorSize);
-          tickEnter.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding));
-          tickUpdate.select("line").attr("x2", -tickMajorSize).attr("y2", 0);
-          tickUpdate.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "end");
-          pathUpdate.attr("d", "M" + -tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + -tickEndSize);
-          break;
-        }
-        case "right": {
-          tickTransform = d3_svg_axisY;
-          subtickEnter.attr("x2", tickMinorSize);
-          subtickUpdate.attr("x2", tickMinorSize).attr("y2", 0);
-          tickEnter.select("line").attr("x2", tickMajorSize);
-          tickEnter.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding);
-          tickUpdate.select("line").attr("x2", tickMajorSize).attr("y2", 0);
-          tickUpdate.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "start");
-          pathUpdate.attr("d", "M" + tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + tickEndSize);
-          break;
-        }
-      }
-
-      // For quantitative scales:
-      // - enter new ticks from the old scale
-      // - exit old ticks to the new scale
-      if (scale.ticks) {
-        tickEnter.call(tickTransform, scale0);
-        tickUpdate.call(tickTransform, scale1);
-        tickExit.call(tickTransform, scale1);
-        subtickEnter.call(tickTransform, scale0);
-        subtickUpdate.call(tickTransform, scale1);
-        subtickExit.call(tickTransform, scale1);
-      }
-
-      // For ordinal scales:
-      // - any entering ticks are undefined in the old scale
-      // - any exiting ticks are undefined in the new scale
-      // Therefore, we only need to transition updating ticks.
-      else {
-        var dx = scale1.rangeBand() / 2, x = function(d) { return scale1(d) + dx; };
-        tickEnter.call(tickTransform, x);
-        tickUpdate.call(tickTransform, x);
-      }
-    });
-  }
-
-  axis.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = x;
-    return axis;
-  };
-
-  axis.orient = function(x) {
-    if (!arguments.length) return orient;
-    orient = x;
-    return axis;
-  };
-
-  axis.ticks = function() {
-    if (!arguments.length) return tickArguments_;
-    tickArguments_ = arguments;
-    return axis;
-  };
-
-  axis.tickFormat = function(x) {
-    if (!arguments.length) return tickFormat_;
-    tickFormat_ = x;
-    return axis;
-  };
-
-  axis.tickSize = function(x, y, z) {
-    if (!arguments.length) return tickMajorSize;
-    var n = arguments.length - 1;
-    tickMajorSize = +x;
-    tickMinorSize = n > 1 ? +y : tickMajorSize;
-    tickEndSize = n > 0 ? +arguments[n] : tickMajorSize;
-    return axis;
-  };
-
-  axis.tickPadding = function(x) {
-    if (!arguments.length) return tickPadding;
-    tickPadding = +x;
-    return axis;
-  };
-
-  axis.tickSubdivide = function(x) {
-    if (!arguments.length) return tickSubdivide;
-    tickSubdivide = +x;
-    return axis;
-  };
-
-  return axis;
-};
-
-function d3_svg_axisX(selection, x) {
-  selection.attr("transform", function(d) { return "translate(" + x(d) + ",0)"; });
-}
-
-function d3_svg_axisY(selection, y) {
-  selection.attr("transform", function(d) { return "translate(0," + y(d) + ")"; });
-}
-
-function d3_svg_axisSubdivide(scale, ticks, m) {
-  subticks = [];
-  if (m && ticks.length > 1) {
-    var extent = d3_scaleExtent(scale.domain()),
-        subticks,
-        i = -1,
-        n = ticks.length,
-        d = (ticks[1] - ticks[0]) / ++m,
-        j,
-        v;
-    while (++i < n) {
-      for (j = m; --j > 0;) {
-        if ((v = +ticks[i] - j * d) >= extent[0]) {
-          subticks.push(v);
-        }
-      }
-    }
-    for (--i, j = 0; ++j < m && (v = +ticks[i] + j * d) < extent[1];) {
-      subticks.push(v);
-    }
-  }
-  return subticks;
-}
-d3.svg.brush = function() {
-  var event = d3.dispatch("brushstart", "brush", "brushend"),
-      x, // x-scale, optional
-      y, // y-scale, optional
-      extent = [[0, 0], [0, 0]]; // [x0, y0], [x1, y1]
-
-  function brush(g) {
-    var resizes = x && y ? ["n", "e", "s", "w", "nw", "ne", "se", "sw"]
-        : x ? ["e", "w"]
-        : y ? ["n", "s"]
-        : [];
-
-    g.each(function() {
-      var g = d3.select(this).on("mousedown.brush", down),
-          bg = g.selectAll(".background").data([,]),
-          fg = g.selectAll(".extent").data([,]),
-          tz = g.selectAll(".resize").data(resizes, String),
-          e;
-
-      // An invisible, mouseable area for starting a new brush.
-      bg.enter().append("rect")
-          .attr("class", "background")
-          .style("visibility", "hidden")
-          .style("pointer-events", "all")
-          .style("cursor", "crosshair");
-
-      // The visible brush extent; style this as you like!
-      fg.enter().append("rect")
-          .attr("class", "extent")
-          .style("cursor", "move");
-
-      // More invisible rects for resizing the extent.
-      tz.enter().append("rect")
-          .attr("class", function(d) { return "resize " + d; })
-          .attr("width", 6)
-          .attr("height", 6)
-          .style("visibility", "hidden")
-          .style("pointer-events", brush.empty() ? "none" : "all")
-          .style("cursor", function(d) { return d3_svg_brushCursor[d]; });
-
-      // Remove any superfluous resizers.
-      tz.exit().remove();
-
-      // Initialize the background to fill the defined range.
-      // If the range isn't defined, you can post-process.
-      if (x) {
-        e = d3_scaleRange(x);
-        bg.attr("x", e[0]).attr("width", e[1] - e[0]);
-        d3_svg_brushRedrawX(g, extent);
-      }
-      if (y) {
-        e = d3_scaleRange(y);
-        bg.attr("y", e[0]).attr("height", e[1] - e[0]);
-        d3_svg_brushRedrawY(g, extent);
-      }
-    });
-  }
-
-  function down() {
-    var target = d3.select(d3.event.target);
-
-    // Store some global state for the duration of the brush gesture.
-    d3_svg_brush = brush;
-    d3_svg_brushTarget = this;
-    d3_svg_brushExtent = extent;
-    d3_svg_brushOffset = d3.svg.mouse(d3_svg_brushTarget);
-
-    // If the extent was clicked on, drag rather than brush;
-    // store the offset between the mouse and extent origin instead.
-    if (d3_svg_brushDrag = target.classed("extent")) {
-      d3_svg_brushOffset[0] = extent[0][0] - d3_svg_brushOffset[0];
-      d3_svg_brushOffset[1] = extent[0][1] - d3_svg_brushOffset[1];
-    }
-
-    // If a resizer was clicked on, record which side is to be resized.
-    // Also, set the offset to the opposite side.
-    else if (target.classed("resize")) {
-      d3_svg_brushResize = d3.event.target.__data__;
-      d3_svg_brushOffset[0] = extent[+/w$/.test(d3_svg_brushResize)][0];
-      d3_svg_brushOffset[1] = extent[+/^n/.test(d3_svg_brushResize)][1];
-    }
-
-    // If the ALT key is down when starting a brush, the center is at the mouse.
-    else if (d3.event.altKey) {
-      d3_svg_brushCenter = d3_svg_brushOffset.slice();
-    }
-
-    // Restrict which dimensions are resized.
-    d3_svg_brushX = !/^(n|s)$/.test(d3_svg_brushResize) && x;
-    d3_svg_brushY = !/^(e|w)$/.test(d3_svg_brushResize) && y;
-
-    // Notify listeners.
-    d3_svg_brushDispatch = dispatcher(this, arguments);
-    d3_svg_brushDispatch("brushstart");
-    d3_svg_brushMove();
-    d3_eventCancel();
-  }
-
-  function dispatcher(that, argumentz) {
-    return function(type) {
-      var e = d3.event;
-      try {
-        d3.event = {type: type, target: brush};
-        event[type].apply(that, argumentz);
-      } finally {
-        d3.event = e;
-      }
-    };
-  }
-
-  brush.x = function(z) {
-    if (!arguments.length) return x;
-    x = z;
-    return brush;
-  };
-
-  brush.y = function(z) {
-    if (!arguments.length) return y;
-    y = z;
-    return brush;
-  };
-
-  brush.extent = function(z) {
-    var x0, x1, y0, y1, t;
-
-    // Invert the pixel extent to data-space.
-    if (!arguments.length) {
-      if (x) {
-        x0 = extent[0][0], x1 = extent[1][0];
-        if (x.invert) x0 = x.invert(x0), x1 = x.invert(x1);
-        if (x1 < x0) t = x0, x0 = x1, x1 = t;
-      }
-      if (y) {
-        y0 = extent[0][1], y1 = extent[1][1];
-        if (y.invert) y0 = y.invert(y0), y1 = y.invert(y1);
-        if (y1 < y0) t = y0, y0 = y1, y1 = t;
-      }
-      return x && y ? [[x0, y0], [x1, y1]] : x ? [x0, x1] : y && [y0, y1];
-    }
-
-    // Scale the data-space extent to pixels.
-    if (x) {
-      x0 = z[0], x1 = z[1];
-      if (y) x0 = x0[0], x1 = x1[0];
-      if (x.invert) x0 = x(x0), x1 = x(x1);
-      if (x1 < x0) t = x0, x0 = x1, x1 = t;
-      extent[0][0] = x0, extent[1][0] = x1;
-    }
-    if (y) {
-      y0 = z[0], y1 = z[1];
-      if (x) y0 = y0[1], y1 = y1[1];
-      if (y.invert) y0 = y(y0), y1 = y(y1);
-      if (y1 < y0) t = y0, y0 = y1, y1 = t;
-      extent[0][1] = y0, extent[1][1] = y1;
-    }
-
-    return brush;
-  };
-
-  brush.clear = function() {
-    extent[0][0] =
-    extent[0][1] =
-    extent[1][0] =
-    extent[1][1] = 0;
-    return brush;
-  };
-
-  brush.empty = function() {
-    return (x && extent[0][0] === extent[1][0])
-        || (y && extent[0][1] === extent[1][1]);
-  };
-
-  d3.select(window)
-      .on("mousemove.brush", d3_svg_brushMove)
-      .on("mouseup.brush", d3_svg_brushUp)
-      .on("keydown.brush", d3_svg_brushKeydown)
-      .on("keyup.brush", d3_svg_brushKeyup);
-
-  return d3.rebind(brush, event, "on");
-};
-
-var d3_svg_brush,
-    d3_svg_brushDispatch,
-    d3_svg_brushTarget,
-    d3_svg_brushX,
-    d3_svg_brushY,
-    d3_svg_brushExtent,
-    d3_svg_brushDrag,
-    d3_svg_brushResize,
-    d3_svg_brushCenter,
-    d3_svg_brushOffset;
-
-function d3_svg_brushRedrawX(g, extent) {
-  g.select(".extent").attr("x", extent[0][0]);
-  g.selectAll(".n,.s,.w,.nw,.sw").attr("x", extent[0][0] - 2);
-  g.selectAll(".e,.ne,.se").attr("x", extent[1][0] - 3);
-  g.selectAll(".extent,.n,.s").attr("width", extent[1][0] - extent[0][0]);
-}
-
-function d3_svg_brushRedrawY(g, extent) {
-  g.select(".extent").attr("y", extent[0][1]);
-  g.selectAll(".n,.e,.w,.nw,.ne").attr("y", extent[0][1] - 3);
-  g.selectAll(".s,.se,.sw").attr("y", extent[1][1] - 4);
-  g.selectAll(".extent,.e,.w").attr("height", extent[1][1] - extent[0][1]);
-}
-
-function d3_svg_brushKeydown() {
-  if (d3.event.keyCode == 32 && d3_svg_brushTarget && !d3_svg_brushDrag) {
-    d3_svg_brushCenter = null;
-    d3_svg_brushOffset[0] -= d3_svg_brushExtent[1][0];
-    d3_svg_brushOffset[1] -= d3_svg_brushExtent[1][1];
-    d3_svg_brushDrag = 2;
-    d3_eventCancel();
-  }
-}
-
-function d3_svg_brushKeyup() {
-  if (d3.event.keyCode == 32 && d3_svg_brushDrag == 2) {
-    d3_svg_brushOffset[0] += d3_svg_brushExtent[1][0];
-    d3_svg_brushOffset[1] += d3_svg_brushExtent[1][1];
-    d3_svg_brushDrag = 0;
-    d3_eventCancel();
-  }
-}
-
-function d3_svg_brushMove() {
-  if (d3_svg_brushOffset) {
-    var mouse = d3.svg.mouse(d3_svg_brushTarget),
-        g = d3.select(d3_svg_brushTarget);
-
-    if (!d3_svg_brushDrag) {
-
-      // If needed, determine the center from the current extent.
-      if (d3.event.altKey) {
-        if (!d3_svg_brushCenter) {
-          d3_svg_brushCenter = [
-            (d3_svg_brushExtent[0][0] + d3_svg_brushExtent[1][0]) / 2,
-            (d3_svg_brushExtent[0][1] + d3_svg_brushExtent[1][1]) / 2
-          ];
-        }
-
-        // Update the offset, for when the ALT key is released.
-        d3_svg_brushOffset[0] = d3_svg_brushExtent[+(mouse[0] < d3_svg_brushCenter[0])][0];
-        d3_svg_brushOffset[1] = d3_svg_brushExtent[+(mouse[1] < d3_svg_brushCenter[1])][1];
-      }
-
-      // When the ALT key is released, we clear the center.
-      else d3_svg_brushCenter = null;
-    }
-
-    // Update the brush extent for each dimension.
-    if (d3_svg_brushX) {
-      d3_svg_brushMove1(mouse, d3_svg_brushX, 0);
-      d3_svg_brushRedrawX(g, d3_svg_brushExtent);
-    }
-    if (d3_svg_brushY) {
-      d3_svg_brushMove1(mouse, d3_svg_brushY, 1);
-      d3_svg_brushRedrawY(g, d3_svg_brushExtent);
-    }
-
-    // Notify listeners.
-    d3_svg_brushDispatch("brush");
-  }
-}
-
-function d3_svg_brushMove1(mouse, scale, i) {
-  var range = d3_scaleRange(scale),
-      r0 = range[0],
-      r1 = range[1],
-      offset = d3_svg_brushOffset[i],
-      size = d3_svg_brushExtent[1][i] - d3_svg_brushExtent[0][i],
-      min,
-      max;
-
-  // When dragging, reduce the range by the extent size and offset.
-  if (d3_svg_brushDrag) {
-    r0 -= offset;
-    r1 -= size + offset;
-  }
-
-  // Clamp the mouse so that the extent fits within the range extent.
-  min = Math.max(r0, Math.min(r1, mouse[i]));
-
-  // Compute the new extent bounds.
-  if (d3_svg_brushDrag) {
-    max = (min += offset) + size;
-  } else {
-
-    // If the ALT key is pressed, then preserve the center of the extent.
-    if (d3_svg_brushCenter) offset = Math.max(r0, Math.min(r1, 2 * d3_svg_brushCenter[i] - min));
-
-    // Compute the min and max of the offset and mouse.
-    if (offset < min) {
-      max = min;
-      min = offset;
-    } else {
-      max = offset;
-    }
-  }
-
-  // Update the stored bounds.
-  d3_svg_brushExtent[0][i] = min;
-  d3_svg_brushExtent[1][i] = max;
-}
-
-function d3_svg_brushUp() {
-  if (d3_svg_brushOffset) {
-    d3_svg_brushMove();
-    d3.select(d3_svg_brushTarget).selectAll(".resize").style("pointer-events", d3_svg_brush.empty() ? "none" : "all");
-    d3_svg_brushDispatch("brushend");
-    d3_svg_brush =
-    d3_svg_brushDispatch =
-    d3_svg_brushTarget =
-    d3_svg_brushX =
-    d3_svg_brushY =
-    d3_svg_brushExtent =
-    d3_svg_brushDrag =
-    d3_svg_brushResize =
-    d3_svg_brushCenter =
-    d3_svg_brushOffset = null;
-    d3_eventCancel();
-  }
-}
-
-var d3_svg_brushCursor = {
-  n: "ns-resize",
-  e: "ew-resize",
-  s: "ns-resize",
-  w: "ew-resize",
-  nw: "nwse-resize",
-  ne: "nesw-resize",
-  se: "nwse-resize",
-  sw: "nesw-resize"
-};
-d3.behavior = {};
-// TODO Track touch points by identifier.
-
-d3.behavior.drag = function() {
-  var event = d3.dispatch("drag", "dragstart", "dragend"),
-      origin = null;
-
-  function drag() {
-    this
-        .on("mousedown.drag", mousedown)
-        .on("touchstart.drag", mousedown);
-
-    d3.select(window)
-        .on("mousemove.drag", d3_behavior_dragMove)
-        .on("touchmove.drag", d3_behavior_dragMove)
-        .on("mouseup.drag", d3_behavior_dragUp, true)
-        .on("touchend.drag", d3_behavior_dragUp, true)
-        .on("click.drag", d3_behavior_dragClick, true);
-  }
-
-  // snapshot the local context for subsequent dispatch
-  function start() {
-    d3_behavior_dragEvent = event;
-    d3_behavior_dragEventTarget = d3.event.target;
-    d3_behavior_dragTarget = this;
-    d3_behavior_dragArguments = arguments;
-    d3_behavior_dragOrigin = d3_behavior_dragPoint();
-    if (origin) {
-      d3_behavior_dragOffset = origin.apply(d3_behavior_dragTarget, d3_behavior_dragArguments);
-      d3_behavior_dragOffset = [d3_behavior_dragOffset.x - d3_behavior_dragOrigin[0], d3_behavior_dragOffset.y - d3_behavior_dragOrigin[1]];
-    } else {
-      d3_behavior_dragOffset = [0, 0];
-    }
-    d3_behavior_dragMoved = 0;
-  }
-
-  function mousedown() {
-    start.apply(this, arguments);
-    d3_behavior_dragDispatch("dragstart");
-  }
-
-  drag.origin = function(x) {
-    if (!arguments.length) return origin;
-    origin = x;
-    return drag;
-  };
-
-  return d3.rebind(drag, event, "on");
-};
-
-var d3_behavior_dragEvent,
-    d3_behavior_dragEventTarget,
-    d3_behavior_dragTarget,
-    d3_behavior_dragArguments,
-    d3_behavior_dragOffset,
-    d3_behavior_dragOrigin,
-    d3_behavior_dragMoved;
-
-function d3_behavior_dragDispatch(type) {
-  var p = d3_behavior_dragPoint(),
-      o = d3.event,
-      e = d3.event = {type: type};
-
-  if (p) {
-    e.x = p[0] + d3_behavior_dragOffset[0];
-    e.y = p[1] + d3_behavior_dragOffset[1];
-    e.dx = p[0] - d3_behavior_dragOrigin[0];
-    e.dy = p[1] - d3_behavior_dragOrigin[1];
-    d3_behavior_dragMoved |= e.dx | e.dy;
-    d3_behavior_dragOrigin = p;
-  }
-
-  try {
-    d3_behavior_dragEvent[type].apply(d3_behavior_dragTarget, d3_behavior_dragArguments);
-  } finally {
-    d3.event = o;
-  }
-
-  o.stopPropagation();
-  o.preventDefault();
-}
-
-function d3_behavior_dragPoint() {
-  var p = d3_behavior_dragTarget.parentNode,
-      t = d3.event.changedTouches;
-  return p && (t
-      ? d3.svg.touches(p, t)[0]
-      : d3.svg.mouse(p));
-}
-
-function d3_behavior_dragMove() {
-  if (!d3_behavior_dragTarget) return;
-  var parent = d3_behavior_dragTarget.parentNode;
-
-  // O NOES! The drag element was removed from the DOM.
-  if (!parent) return d3_behavior_dragUp();
-
-  d3_behavior_dragDispatch("drag");
-  d3_eventCancel();
-}
-
-function d3_behavior_dragUp() {
-  if (!d3_behavior_dragTarget) return;
-  d3_behavior_dragDispatch("dragend");
-
-  // If the node was moved, prevent the mouseup from propagating.
-  // Also prevent the subsequent click from propagating (e.g., for anchors).
-  if (d3_behavior_dragMoved) {
-    d3_eventCancel();
-    d3_behavior_dragMoved = d3.event.target === d3_behavior_dragEventTarget;
-  }
-
-  d3_behavior_dragEvent =
-  d3_behavior_dragEventTarget =
-  d3_behavior_dragTarget =
-  d3_behavior_dragArguments =
-  d3_behavior_dragOffset =
-  d3_behavior_dragOrigin = null;
-}
-
-function d3_behavior_dragClick() {
-  if (d3_behavior_dragMoved) {
-    d3_eventCancel();
-    d3_behavior_dragMoved = 0;
-  }
-}
-// TODO unbind zoom behavior?
-d3.behavior.zoom = function() {
-  var xyz = [0, 0, 0],
-      event = d3.dispatch("zoom"),
-      extent = d3_behavior_zoomInfiniteExtent;
-
-  function zoom() {
-    this
-        .on("mousedown.zoom", mousedown)
-        .on("mousewheel.zoom", mousewheel)
-        .on("DOMMouseScroll.zoom", mousewheel)
-        .on("dblclick.zoom", dblclick)
-        .on("touchstart.zoom", touchstart);
-
-    d3.select(window)
-        .on("mousemove.zoom", d3_behavior_zoomMousemove)
-        .on("mouseup.zoom", d3_behavior_zoomMouseup)
-        .on("touchmove.zoom", d3_behavior_zoomTouchmove)
-        .on("touchend.zoom", d3_behavior_zoomTouchup)
-        .on("click.zoom", d3_behavior_zoomClick, true);
-  }
-
-  // snapshot the local context for subsequent dispatch
-  function start() {
-    d3_behavior_zoomXyz = xyz;
-    d3_behavior_zoomExtent = extent;
-    d3_behavior_zoomDispatch = event.zoom;
-    d3_behavior_zoomEventTarget = d3.event.target;
-    d3_behavior_zoomTarget = this;
-    d3_behavior_zoomArguments = arguments;
-  }
-
-  function mousedown() {
-    start.apply(this, arguments);
-    d3_behavior_zoomPanning = d3_behavior_zoomLocation(d3.svg.mouse(d3_behavior_zoomTarget));
-    d3_behavior_zoomMoved = 0;
-    d3.event.preventDefault();
-    window.focus();
-  }
-
-  // store starting mouse location
-  function mousewheel() {
-    start.apply(this, arguments);
-    if (!d3_behavior_zoomZooming) d3_behavior_zoomZooming = d3_behavior_zoomLocation(d3.svg.mouse(d3_behavior_zoomTarget));
-    d3_behavior_zoomTo(d3_behavior_zoomDelta() + xyz[2], d3.svg.mouse(d3_behavior_zoomTarget), d3_behavior_zoomZooming);
-  }
-
-  function dblclick() {
-    start.apply(this, arguments);
-    var mouse = d3.svg.mouse(d3_behavior_zoomTarget);
-    d3_behavior_zoomTo(d3.event.shiftKey ? Math.ceil(xyz[2] - 1) : Math.floor(xyz[2] + 1), mouse, d3_behavior_zoomLocation(mouse));
-  }
-
-  // doubletap detection
-  function touchstart() {
-    start.apply(this, arguments);
-    var touches = d3_behavior_zoomTouchup(),
-        touch,
-        now = Date.now();
-    if ((touches.length === 1) && (now - d3_behavior_zoomLast < 300)) {
-      d3_behavior_zoomTo(1 + Math.floor(xyz[2]), touch = touches[0], d3_behavior_zoomLocations[touch.identifier]);
-    }
-    d3_behavior_zoomLast = now;
-  }
-
-  zoom.extent = function(x) {
-    if (!arguments.length) return extent;
-    extent = x == null ? d3_behavior_zoomInfiniteExtent : x;
-    return zoom;
-  };
-
-  return d3.rebind(zoom, event, "on");
-};
-
-var d3_behavior_zoomDiv,
-    d3_behavior_zoomPanning,
-    d3_behavior_zoomZooming,
-    d3_behavior_zoomLocations = {}, // identifier -> location
-    d3_behavior_zoomLast = 0,
-    d3_behavior_zoomXyz,
-    d3_behavior_zoomExtent,
-    d3_behavior_zoomDispatch,
-    d3_behavior_zoomEventTarget,
-    d3_behavior_zoomTarget,
-    d3_behavior_zoomArguments,
-    d3_behavior_zoomMoved;
-
-function d3_behavior_zoomLocation(point) {
-  return [
-    point[0] - d3_behavior_zoomXyz[0],
-    point[1] - d3_behavior_zoomXyz[1],
-    d3_behavior_zoomXyz[2]
-  ];
-}
-
-// detect the pixels that would be scrolled by this wheel event
-function d3_behavior_zoomDelta() {
-
-  // mousewheel events are totally broken!
-  // https://bugs.webkit.org/show_bug.cgi?id=40441
-  // not only that, but Chrome and Safari differ in re. to acceleration!
-  if (!d3_behavior_zoomDiv) {
-    d3_behavior_zoomDiv = d3.select("body").append("div")
-        .style("visibility", "hidden")
-        .style("top", 0)
-        .style("height", 0)
-        .style("width", 0)
-        .style("overflow-y", "scroll")
-      .append("div")
-        .style("height", "2000px")
-      .node().parentNode;
-  }
-
-  var e = d3.event, delta;
-  try {
-    d3_behavior_zoomDiv.scrollTop = 1000;
-    d3_behavior_zoomDiv.dispatchEvent(e);
-    delta = 1000 - d3_behavior_zoomDiv.scrollTop;
-  } catch (error) {
-    delta = e.wheelDelta || (-e.detail * 5);
-  }
-
-  return delta * .005;
-}
-
-// Note: Since we don't rotate, it's possible for the touches to become
-// slightly detached from their original positions. Thus, we recompute the
-// touch points on touchend as well as touchstart!
-function d3_behavior_zoomTouchup() {
-  var touches = d3.svg.touches(d3_behavior_zoomTarget),
-      i = -1,
-      n = touches.length,
-      touch;
-  while (++i < n) d3_behavior_zoomLocations[(touch = touches[i]).identifier] = d3_behavior_zoomLocation(touch);
-  return touches;
-}
-
-function d3_behavior_zoomTouchmove() {
-  var touches = d3.svg.touches(d3_behavior_zoomTarget);
-  switch (touches.length) {
-
-    // single-touch pan
-    case 1: {
-      var touch = touches[0];
-      d3_behavior_zoomTo(d3_behavior_zoomXyz[2], touch, d3_behavior_zoomLocations[touch.identifier]);
-      break;
-    }
-
-    // double-touch pan + zoom
-    case 2: {
-      var p0 = touches[0],
-          p1 = touches[1],
-          p2 = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2],
-          l0 = d3_behavior_zoomLocations[p0.identifier],
-          l1 = d3_behavior_zoomLocations[p1.identifier],
-          l2 = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2, l0[2]];
-      d3_behavior_zoomTo(Math.log(d3.event.scale) / Math.LN2 + l0[2], p2, l2);
-      break;
-    }
-  }
-}
-
-function d3_behavior_zoomMousemove() {
-  d3_behavior_zoomZooming = null;
-  if (d3_behavior_zoomPanning) {
-    d3_behavior_zoomMoved = 1;
-    d3_behavior_zoomTo(d3_behavior_zoomXyz[2], d3.svg.mouse(d3_behavior_zoomTarget), d3_behavior_zoomPanning);
-  }
-}
-
-function d3_behavior_zoomMouseup() {
-  if (d3_behavior_zoomPanning) {
-    if (d3_behavior_zoomMoved) {
-      d3_eventCancel();
-      d3_behavior_zoomMoved = d3_behavior_zoomEventTarget === d3.event.target;
-    }
-
-    d3_behavior_zoomXyz =
-    d3_behavior_zoomExtent =
-    d3_behavior_zoomDispatch =
-    d3_behavior_zoomEventTarget =
-    d3_behavior_zoomTarget =
-    d3_behavior_zoomArguments =
-    d3_behavior_zoomPanning = null;
-  }
-}
-
-function d3_behavior_zoomClick() {
-  if (d3_behavior_zoomMoved) {
-    d3_eventCancel();
-    d3_behavior_zoomMoved = 0;
-  }
-}
-
-function d3_behavior_zoomTo(z, x0, x1) {
-  z = d3_behavior_zoomExtentClamp(z, 2);
-  var j = Math.pow(2, d3_behavior_zoomXyz[2]),
-      k = Math.pow(2, z),
-      K = Math.pow(2, (d3_behavior_zoomXyz[2] = z) - x1[2]),
-      x_ = d3_behavior_zoomXyz[0],
-      y_ = d3_behavior_zoomXyz[1],
-      x = d3_behavior_zoomXyz[0] = d3_behavior_zoomExtentClamp((x0[0] - x1[0] * K), 0, k),
-      y = d3_behavior_zoomXyz[1] = d3_behavior_zoomExtentClamp((x0[1] - x1[1] * K), 1, k),
-      o = d3.event; // Events can be reentrant (e.g., focus).
-
-  d3.event = {
-    scale: k,
-    translate: [x, y],
-    transform: function(sx, sy) {
-      if (sx) transform(sx, x_, x);
-      if (sy) transform(sy, y_, y);
-    }
-  };
-
-  function transform(scale, a, b) {
-    scale.domain(scale.range().map(function(v) { return scale.invert(((v - b) * j) / k + a); }));
-  }
-
-  try {
-    d3_behavior_zoomDispatch.apply(d3_behavior_zoomTarget, d3_behavior_zoomArguments);
-  } finally {
-    d3.event = o;
-  }
-
-  o.preventDefault();
-}
-
-var d3_behavior_zoomInfiniteExtent = [
-  [-Infinity, Infinity],
-  [-Infinity, Infinity],
-  [-Infinity, Infinity]
-];
-
-function d3_behavior_zoomExtentClamp(x, i, k) {
-  var range = d3_behavior_zoomExtent[i],
-      r0 = range[0],
-      r1 = range[1];
-  return arguments.length === 3
-      ? Math.max(r1 * (r1 === Infinity ? -Infinity : 1 / k - 1),
-        Math.min(r0 === -Infinity ? Infinity : r0, x / k)) * k
-      : Math.max(r0, Math.min(r1, x));
-}
-})();
diff --git a/visualize/static/d3.layout.js b/visualize/static/d3.layout.js
deleted file mode 100644
index d93fbe5c..00000000
--- a/visualize/static/d3.layout.js
+++ /dev/null
@@ -1,1881 +0,0 @@
-(function(){d3.layout = {};
-// Implements hierarchical edge bundling using Holten's algorithm. For each
-// input link, a path is computed that travels through the tree, up the parent
-// hierarchy to the least common ancestor, and then back down to the destination
-// node. Each path is simply an array of nodes.
-d3.layout.bundle = function() {
-  return function(links) {
-    var paths = [],
-        i = -1,
-        n = links.length;
-    while (++i < n) paths.push(d3_layout_bundlePath(links[i]));
-    return paths;
-  };
-};
-
-function d3_layout_bundlePath(link) {
-  var start = link.source,
-      end = link.target,
-      lca = d3_layout_bundleLeastCommonAncestor(start, end),
-      points = [start];
-  while (start !== lca) {
-    start = start.parent;
-    points.push(start);
-  }
-  var k = points.length;
-  while (end !== lca) {
-    points.splice(k, 0, end);
-    end = end.parent;
-  }
-  return points;
-}
-
-function d3_layout_bundleAncestors(node) {
-  var ancestors = [],
-      parent = node.parent;
-  while (parent != null) {
-    ancestors.push(node);
-    node = parent;
-    parent = parent.parent;
-  }
-  ancestors.push(node);
-  return ancestors;
-}
-
-function d3_layout_bundleLeastCommonAncestor(a, b) {
-  if (a === b) return a;
-  var aNodes = d3_layout_bundleAncestors(a),
-      bNodes = d3_layout_bundleAncestors(b),
-      aNode = aNodes.pop(),
-      bNode = bNodes.pop(),
-      sharedNode = null;
-  while (aNode === bNode) {
-    sharedNode = aNode;
-    aNode = aNodes.pop();
-    bNode = bNodes.pop();
-  }
-  return sharedNode;
-}
-d3.layout.chord = function() {
-  var chord = {},
-      chords,
-      groups,
-      matrix,
-      n,
-      padding = 0,
-      sortGroups,
-      sortSubgroups,
-      sortChords;
-
-  function relayout() {
-    var subgroups = {},
-        groupSums = [],
-        groupIndex = d3.range(n),
-        subgroupIndex = [],
-        k,
-        x,
-        x0,
-        i,
-        j;
-
-    chords = [];
-    groups = [];
-
-    // Compute the sum.
-    k = 0, i = -1; while (++i < n) {
-      x = 0, j = -1; while (++j < n) {
-        x += matrix[i][j];
-      }
-      groupSums.push(x);
-      subgroupIndex.push(d3.range(n));
-      k += x;
-    }
-
-    // Sort groups…
-    if (sortGroups) {
-      groupIndex.sort(function(a, b) {
-        return sortGroups(groupSums[a], groupSums[b]);
-      });
-    }
-
-    // Sort subgroups…
-    if (sortSubgroups) {
-      subgroupIndex.forEach(function(d, i) {
-        d.sort(function(a, b) {
-          return sortSubgroups(matrix[i][a], matrix[i][b]);
-        });
-      });
-    }
-
-    // Convert the sum to scaling factor for [0, 2pi].
-    // TODO Allow start and end angle to be specified.
-    // TODO Allow padding to be specified as percentage?
-    k = (2 * Math.PI - padding * n) / k;
-
-    // Compute the start and end angle for each group and subgroup.
-    // Note: Opera has a bug reordering object literal properties!
-    x = 0, i = -1; while (++i < n) {
-      x0 = x, j = -1; while (++j < n) {
-        var di = groupIndex[i],
-            dj = subgroupIndex[di][j],
-            v = matrix[di][dj],
-            a0 = x,
-            a1 = x += v * k;
-        subgroups[di + "-" + dj] = {
-          index: di,
-          subindex: dj,
-          startAngle: a0,
-          endAngle: a1,
-          value: v
-        };
-      }
-      groups.push({
-        index: di,
-        startAngle: x0,
-        endAngle: x,
-        value: (x - x0) / k
-      });
-      x += padding;
-    }
-
-    // Generate chords for each (non-empty) subgroup-subgroup link.
-    i = -1; while (++i < n) {
-      j = i - 1; while (++j < n) {
-        var source = subgroups[i + "-" + j],
-            target = subgroups[j + "-" + i];
-        if (source.value || target.value) {
-          chords.push(source.value < target.value
-              ? {source: target, target: source}
-              : {source: source, target: target});
-        }
-      }
-    }
-
-    if (sortChords) resort();
-  }
-
-  function resort() {
-    chords.sort(function(a, b) {
-      return sortChords(
-          (a.source.value + a.target.value) / 2,
-          (b.source.value + b.target.value) / 2);
-    });
-  }
-
-  chord.matrix = function(x) {
-    if (!arguments.length) return matrix;
-    n = (matrix = x) && matrix.length;
-    chords = groups = null;
-    return chord;
-  };
-
-  chord.padding = function(x) {
-    if (!arguments.length) return padding;
-    padding = x;
-    chords = groups = null;
-    return chord;
-  };
-
-  chord.sortGroups = function(x) {
-    if (!arguments.length) return sortGroups;
-    sortGroups = x;
-    chords = groups = null;
-    return chord;
-  };
-
-  chord.sortSubgroups = function(x) {
-    if (!arguments.length) return sortSubgroups;
-    sortSubgroups = x;
-    chords = null;
-    return chord;
-  };
-
-  chord.sortChords = function(x) {
-    if (!arguments.length) return sortChords;
-    sortChords = x;
-    if (chords) resort();
-    return chord;
-  };
-
-  chord.chords = function() {
-    if (!chords) relayout();
-    return chords;
-  };
-
-  chord.groups = function() {
-    if (!groups) relayout();
-    return groups;
-  };
-
-  return chord;
-};
-// A rudimentary force layout using Gauss-Seidel.
-d3.layout.force = function() {
-  var force = {},
-      event = d3.dispatch("tick"),
-      size = [1, 1],
-      drag,
-      alpha,
-      friction = .9,
-      linkDistance = d3_layout_forceLinkDistance,
-      linkStrength = d3_layout_forceLinkStrength,
-      charge = -30,
-      gravity = .1,
-      theta = .8,
-      interval,
-      nodes = [],
-      links = [],
-      distances,
-      strengths,
-      charges;
-
-  function repulse(node) {
-    return function(quad, x1, y1, x2, y2) {
-      if (quad.point !== node) {
-        var dx = quad.cx - node.x,
-            dy = quad.cy - node.y,
-            dn = 1 / Math.sqrt(dx * dx + dy * dy);
-
-        /* Barnes-Hut criterion. */
-        if ((x2 - x1) * dn < theta) {
-          var k = quad.charge * dn * dn;
-          node.px -= dx * k;
-          node.py -= dy * k;
-          return true;
-        }
-
-        if (quad.point && isFinite(dn)) {
-          var k = quad.pointCharge * dn * dn;
-          node.px -= dx * k;
-          node.py -= dy * k;
-        }
-      }
-      return !quad.charge;
-    };
-  }
-
-  function tick() {
-    var n = nodes.length,
-        m = links.length,
-        q,
-        i, // current index
-        o, // current object
-        s, // current source
-        t, // current target
-        l, // current distance
-        k, // current force
-        x, // x-distance
-        y; // y-distance
-
-    // gauss-seidel relaxation for links
-    for (i = 0; i < m; ++i) {
-      o = links[i];
-      s = o.source;
-      t = o.target;
-      x = t.x - s.x;
-      y = t.y - s.y;
-      if (l = (x * x + y * y)) {
-        l = alpha * strengths[i] * ((l = Math.sqrt(l)) - distances[i]) / l;
-        x *= l;
-        y *= l;
-        t.x -= x * (k = s.weight / (t.weight + s.weight));
-        t.y -= y * k;
-        s.x += x * (k = 1 - k);
-        s.y += y * k;
-      }
-    }
-
-    // apply gravity forces
-    if (k = alpha * gravity) {
-      x = size[0] / 2;
-      y = size[1] / 2;
-      i = -1; if (k) while (++i < n) {
-        o = nodes[i];
-        o.x += (x - o.x) * k;
-        o.y += (y - o.y) * k;
-      }
-    }
-
-    // compute quadtree center of mass and apply charge forces
-    if (charge) {
-      d3_layout_forceAccumulate(q = d3.geom.quadtree(nodes), alpha, charges);
-      i = -1; while (++i < n) {
-        if (!(o = nodes[i]).fixed) {
-          q.visit(repulse(o));
-        }
-      }
-    }
-
-    // position verlet integration
-    i = -1; while (++i < n) {
-      o = nodes[i];
-      if (o.fixed) {
-        o.x = o.px;
-        o.y = o.py;
-      } else {
-        o.x -= (o.px - (o.px = o.x)) * friction;
-        o.y -= (o.py - (o.py = o.y)) * friction;
-      }
-    }
-
-    event.tick({type: "tick", alpha: alpha});
-
-    // simulated annealing, basically
-    return (alpha *= .99) < .005;
-  }
-
-  force.nodes = function(x) {
-    if (!arguments.length) return nodes;
-    nodes = x;
-    return force;
-  };
-
-  force.links = function(x) {
-    if (!arguments.length) return links;
-    links = x;
-    return force;
-  };
-
-  force.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return force;
-  };
-
-  force.linkDistance = function(x) {
-    if (!arguments.length) return linkDistance;
-    linkDistance = d3.functor(x);
-    return force;
-  };
-
-  // For backwards-compatibility.
-  force.distance = force.linkDistance;
-
-  force.linkStrength = function(x) {
-    if (!arguments.length) return linkStrength;
-    linkStrength = d3.functor(x);
-    return force;
-  };
-
-  force.friction = function(x) {
-    if (!arguments.length) return friction;
-    friction = x;
-    return force;
-  };
-
-  force.charge = function(x) {
-    if (!arguments.length) return charge;
-    charge = typeof x === "function" ? x : +x;
-    return force;
-  };
-
-  force.gravity = function(x) {
-    if (!arguments.length) return gravity;
-    gravity = x;
-    return force;
-  };
-
-  force.theta = function(x) {
-    if (!arguments.length) return theta;
-    theta = x;
-    return force;
-  };
-
-  force.start = function() {
-    var i,
-        j,
-        n = nodes.length,
-        m = links.length,
-        w = size[0],
-        h = size[1],
-        neighbors,
-        o;
-
-    for (i = 0; i < n; ++i) {
-      (o = nodes[i]).index = i;
-      o.weight = 0;
-    }
-
-    distances = [];
-    strengths = [];
-    for (i = 0; i < m; ++i) {
-      o = links[i];
-      if (typeof o.source == "number") o.source = nodes[o.source];
-      if (typeof o.target == "number") o.target = nodes[o.target];
-      distances[i] = linkDistance.call(this, o, i);
-      strengths[i] = linkStrength.call(this, o, i);
-      ++o.source.weight;
-      ++o.target.weight;
-    }
-
-    for (i = 0; i < n; ++i) {
-      o = nodes[i];
-      if (isNaN(o.x)) o.x = position("x", w);
-      if (isNaN(o.y)) o.y = position("y", h);
-      if (isNaN(o.px)) o.px = o.x;
-      if (isNaN(o.py)) o.py = o.y;
-    }
-
-    charges = [];
-    if (typeof charge === "function") {
-      for (i = 0; i < n; ++i) {
-        charges[i] = +charge.call(this, nodes[i], i);
-      }
-    } else {
-      for (i = 0; i < n; ++i) {
-        charges[i] = charge;
-      }
-    }
-
-    // initialize node position based on first neighbor
-    function position(dimension, size) {
-      var neighbors = neighbor(i),
-          j = -1,
-          m = neighbors.length,
-          x;
-      while (++j < m) if (!isNaN(x = neighbors[j][dimension])) return x;
-      return Math.random() * size;
-    }
-
-    // initialize neighbors lazily
-    function neighbor() {
-      if (!neighbors) {
-        neighbors = [];
-        for (j = 0; j < n; ++j) {
-          neighbors[j] = [];
-        }
-        for (j = 0; j < m; ++j) {
-          var o = links[j];
-          neighbors[o.source.index].push(o.target);
-          neighbors[o.target.index].push(o.source);
-        }
-      }
-      return neighbors[i];
-    }
-
-    return force.resume();
-  };
-
-  force.resume = function() {
-    alpha = .1;
-    d3.timer(tick);
-    return force;
-  };
-
-  force.stop = function() {
-    alpha = 0;
-    return force;
-  };
-
-  // use `node.call(force.drag)` to make nodes draggable
-  force.drag = function() {
-    if (!drag) drag = d3.behavior.drag()
-        .origin(Object)
-        .on("dragstart", dragstart)
-        .on("drag", d3_layout_forceDrag)
-        .on("dragend", d3_layout_forceDragEnd);
-
-    this.on("mouseover.force", d3_layout_forceDragOver)
-        .on("mouseout.force", d3_layout_forceDragOut)
-        .call(drag);
-  };
-
-  function dragstart(d) {
-    d3_layout_forceDragOver(d3_layout_forceDragNode = d);
-    d3_layout_forceDragForce = force;
-  }
-
-  return d3.rebind(force, event, "on");
-};
-
-var d3_layout_forceDragForce,
-    d3_layout_forceDragNode;
-
-function d3_layout_forceDragOver(d) {
-  d.fixed |= 2;
-}
-
-function d3_layout_forceDragOut(d) {
-  if (d !== d3_layout_forceDragNode) d.fixed &= 1;
-}
-
-function d3_layout_forceDragEnd() {
-  d3_layout_forceDrag();
-  d3_layout_forceDragNode.fixed &= 1;
-  d3_layout_forceDragForce = d3_layout_forceDragNode = null;
-}
-
-function d3_layout_forceDrag() {
-  d3_layout_forceDragNode.px = d3.event.x;
-  d3_layout_forceDragNode.py = d3.event.y;
-  d3_layout_forceDragForce.resume(); // restart annealing
-}
-
-function d3_layout_forceAccumulate(quad, alpha, charges) {
-  var cx = 0,
-      cy = 0;
-  quad.charge = 0;
-  if (!quad.leaf) {
-    var nodes = quad.nodes,
-        n = nodes.length,
-        i = -1,
-        c;
-    while (++i < n) {
-      c = nodes[i];
-      if (c == null) continue;
-      d3_layout_forceAccumulate(c, alpha, charges);
-      quad.charge += c.charge;
-      cx += c.charge * c.cx;
-      cy += c.charge * c.cy;
-    }
-  }
-  if (quad.point) {
-    // jitter internal nodes that are coincident
-    if (!quad.leaf) {
-      quad.point.x += Math.random() - .5;
-      quad.point.y += Math.random() - .5;
-    }
-    var k = alpha * charges[quad.point.index];
-    quad.charge += quad.pointCharge = k;
-    cx += k * quad.point.x;
-    cy += k * quad.point.y;
-  }
-  quad.cx = cx / quad.charge;
-  quad.cy = cy / quad.charge;
-}
-
-function d3_layout_forceLinkDistance(link) {
-  return 20;
-}
-
-function d3_layout_forceLinkStrength(link) {
-  return 1;
-}
-d3.layout.partition = function() {
-  var hierarchy = d3.layout.hierarchy(),
-      size = [1, 1]; // width, height
-
-  function position(node, x, dx, dy) {
-    var children = node.children;
-    node.x = x;
-    node.y = node.depth * dy;
-    node.dx = dx;
-    node.dy = dy;
-    if (children && (n = children.length)) {
-      var i = -1,
-          n,
-          c,
-          d;
-      dx = node.value ? dx / node.value : 0;
-      while (++i < n) {
-        position(c = children[i], x, d = c.value * dx, dy);
-        x += d;
-      }
-    }
-  }
-
-  function depth(node) {
-    var children = node.children,
-        d = 0;
-    if (children && (n = children.length)) {
-      var i = -1,
-          n;
-      while (++i < n) d = Math.max(d, depth(children[i]));
-    }
-    return 1 + d;
-  }
-
-  function partition(d, i) {
-    var nodes = hierarchy.call(this, d, i);
-    position(nodes[0], 0, size[0], size[1] / depth(nodes[0]));
-    return nodes;
-  }
-
-  partition.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return partition;
-  };
-
-  return d3_layout_hierarchyRebind(partition, hierarchy);
-};
-d3.layout.pie = function() {
-  var value = Number,
-      sort = d3_layout_pieSortByValue,
-      startAngle = 0,
-      endAngle = 2 * Math.PI;
-
-  function pie(data, i) {
-
-    // Compute the numeric values for each data element.
-    var values = data.map(function(d, i) { return +value.call(pie, d, i); });
-
-    // Compute the start angle.
-    var a = +(typeof startAngle === "function"
-        ? startAngle.apply(this, arguments)
-        : startAngle);
-
-    // Compute the angular scale factor: from value to radians.
-    var k = ((typeof endAngle === "function"
-        ? endAngle.apply(this, arguments)
-        : endAngle) - startAngle)
-        / d3.sum(values);
-
-    // Optionally sort the data.
-    var index = d3.range(data.length);
-    if (sort != null) index.sort(sort === d3_layout_pieSortByValue
-        ? function(i, j) { return values[j] - values[i]; }
-        : function(i, j) { return sort(data[i], data[j]); });
-
-    // Compute the arcs!
-    // They are stored in the original data's order.
-    var arcs = [];
-    index.forEach(function(i) {
-      arcs[i] = {
-        data: data[i],
-        value: d = values[i],
-        startAngle: a,
-        endAngle: a += d * k
-      };
-    });
-    return arcs;
-  }
-
-  /**
-   * Specifies the value function *x*, which returns a nonnegative numeric value
-   * for each datum. The default value function is `Number`. The value function
-   * is passed two arguments: the current datum and the current index.
-   */
-  pie.value = function(x) {
-    if (!arguments.length) return value;
-    value = x;
-    return pie;
-  };
-
-  /**
-   * Specifies a sort comparison operator *x*. The comparator is passed two data
-   * elements from the data array, a and b; it returns a negative value if a is
-   * less than b, a positive value if a is greater than b, and zero if a equals
-   * b.
-   */
-  pie.sort = function(x) {
-    if (!arguments.length) return sort;
-    sort = x;
-    return pie;
-  };
-
-  /**
-   * Specifies the overall start angle of the pie chart. Defaults to 0. The
-   * start angle can be specified either as a constant or as a function; in the
-   * case of a function, it is evaluated once per array (as opposed to per
-   * element).
-   */
-  pie.startAngle = function(x) {
-    if (!arguments.length) return startAngle;
-    startAngle = x;
-    return pie;
-  };
-
-  /**
-   * Specifies the overall end angle of the pie chart. Defaults to 2π. The
-   * end angle can be specified either as a constant or as a function; in the
-   * case of a function, it is evaluated once per array (as opposed to per
-   * element).
-   */
-  pie.endAngle = function(x) {
-    if (!arguments.length) return endAngle;
-    endAngle = x;
-    return pie;
-  };
-
-  return pie;
-};
-
-var d3_layout_pieSortByValue = {};
-// data is two-dimensional array of x,y; we populate y0
-d3.layout.stack = function() {
-  var values = Object,
-      order = d3_layout_stackOrders["default"],
-      offset = d3_layout_stackOffsets["zero"],
-      out = d3_layout_stackOut,
-      x = d3_layout_stackX,
-      y = d3_layout_stackY;
-
-  function stack(data, index) {
-
-    // Convert series to canonical two-dimensional representation.
-    var series = data.map(function(d, i) {
-      return values.call(stack, d, i);
-    });
-
-    // Convert each series to canonical [[x,y]] representation.
-    var points = series.map(function(d, i) {
-      return d.map(function(v, i) {
-        return [x.call(stack, v, i), y.call(stack, v, i)];
-      });
-    });
-
-    // Compute the order of series, and permute them.
-    var orders = order.call(stack, points, index);
-    series = d3.permute(series, orders);
-    points = d3.permute(points, orders);
-
-    // Compute the baseline…
-    var offsets = offset.call(stack, points, index);
-
-    // And propagate it to other series.
-    var n = series.length,
-        m = series[0].length,
-        i,
-        j,
-        o;
-    for (j = 0; j < m; ++j) {
-      out.call(stack, series[0][j], o = offsets[j], points[0][j][1]);
-      for (i = 1; i < n; ++i) {
-        out.call(stack, series[i][j], o += points[i - 1][j][1], points[i][j][1]);
-      }
-    }
-
-    return data;
-  }
-
-  stack.values = function(x) {
-    if (!arguments.length) return values;
-    values = x;
-    return stack;
-  };
-
-  stack.order = function(x) {
-    if (!arguments.length) return order;
-    order = typeof x === "function" ? x : d3_layout_stackOrders[x];
-    return stack;
-  };
-
-  stack.offset = function(x) {
-    if (!arguments.length) return offset;
-    offset = typeof x === "function" ? x : d3_layout_stackOffsets[x];
-    return stack;
-  };
-
-  stack.x = function(z) {
-    if (!arguments.length) return x;
-    x = z;
-    return stack;
-  };
-
-  stack.y = function(z) {
-    if (!arguments.length) return y;
-    y = z;
-    return stack;
-  };
-
-  stack.out = function(z) {
-    if (!arguments.length) return out;
-    out = z;
-    return stack;
-  };
-
-  return stack;
-}
-
-function d3_layout_stackX(d) {
-  return d.x;
-}
-
-function d3_layout_stackY(d) {
-  return d.y;
-}
-
-function d3_layout_stackOut(d, y0, y) {
-  d.y0 = y0;
-  d.y = y;
-}
-
-var d3_layout_stackOrders = {
-
-  "inside-out": function(data) {
-    var n = data.length,
-        i,
-        j,
-        max = data.map(d3_layout_stackMaxIndex),
-        sums = data.map(d3_layout_stackReduceSum),
-        index = d3.range(n).sort(function(a, b) { return max[a] - max[b]; }),
-        top = 0,
-        bottom = 0,
-        tops = [],
-        bottoms = [];
-    for (i = 0; i < n; ++i) {
-      j = index[i];
-      if (top < bottom) {
-        top += sums[j];
-        tops.push(j);
-      } else {
-        bottom += sums[j];
-        bottoms.push(j);
-      }
-    }
-    return bottoms.reverse().concat(tops);
-  },
-
-  "reverse": function(data) {
-    return d3.range(data.length).reverse();
-  },
-
-  "default": function(data) {
-    return d3.range(data.length);
-  }
-
-};
-
-var d3_layout_stackOffsets = {
-
-  "silhouette": function(data) {
-    var n = data.length,
-        m = data[0].length,
-        sums = [],
-        max = 0,
-        i,
-        j,
-        o,
-        y0 = [];
-    for (j = 0; j < m; ++j) {
-      for (i = 0, o = 0; i < n; i++) o += data[i][j][1];
-      if (o > max) max = o;
-      sums.push(o);
-    }
-    for (j = 0; j < m; ++j) {
-      y0[j] = (max - sums[j]) / 2;
-    }
-    return y0;
-  },
-
-  "wiggle": function(data) {
-    var n = data.length,
-        x = data[0],
-        m = x.length,
-        max = 0,
-        i,
-        j,
-        k,
-        s1,
-        s2,
-        s3,
-        dx,
-        o,
-        o0,
-        y0 = [];
-    y0[0] = o = o0 = 0;
-    for (j = 1; j < m; ++j) {
-      for (i = 0, s1 = 0; i < n; ++i) s1 += data[i][j][1];
-      for (i = 0, s2 = 0, dx = x[j][0] - x[j - 1][0]; i < n; ++i) {
-        for (k = 0, s3 = (data[i][j][1] - data[i][j - 1][1]) / (2 * dx); k < i; ++k) {
-          s3 += (data[k][j][1] - data[k][j - 1][1]) / dx;
-        }
-        s2 += s3 * data[i][j][1];
-      }
-      y0[j] = o -= s1 ? s2 / s1 * dx : 0;
-      if (o < o0) o0 = o;
-    }
-    for (j = 0; j < m; ++j) y0[j] -= o0;
-    return y0;
-  },
-
-  "expand": function(data) {
-    var n = data.length,
-        m = data[0].length,
-        k = 1 / n,
-        i,
-        j,
-        o,
-        y0 = [];
-    for (j = 0; j < m; ++j) {
-      for (i = 0, o = 0; i < n; i++) o += data[i][j][1];
-      if (o) for (i = 0; i < n; i++) data[i][j][1] /= o;
-      else for (i = 0; i < n; i++) data[i][j][1] = k;
-    }
-    for (j = 0; j < m; ++j) y0[j] = 0;
-    return y0;
-  },
-
-  "zero": function(data) {
-    var j = -1,
-        m = data[0].length,
-        y0 = [];
-    while (++j < m) y0[j] = 0;
-    return y0;
-  }
-
-};
-
-function d3_layout_stackMaxIndex(array) {
-  var i = 1,
-      j = 0,
-      v = array[0][1],
-      k,
-      n = array.length;
-  for (; i < n; ++i) {
-    if ((k = array[i][1]) > v) {
-      j = i;
-      v = k;
-    }
-  }
-  return j;
-}
-
-function d3_layout_stackReduceSum(d) {
-  return d.reduce(d3_layout_stackSum, 0);
-}
-
-function d3_layout_stackSum(p, d) {
-  return p + d[1];
-}
-d3.layout.histogram = function() {
-  var frequency = true,
-      valuer = Number,
-      ranger = d3_layout_histogramRange,
-      binner = d3_layout_histogramBinSturges;
-
-  function histogram(data, i) {
-    var bins = [],
-        values = data.map(valuer, this),
-        range = ranger.call(this, values, i),
-        thresholds = binner.call(this, range, values, i),
-        bin,
-        i = -1,
-        n = values.length,
-        m = thresholds.length - 1,
-        k = frequency ? 1 : 1 / n,
-        x;
-
-    // Initialize the bins.
-    while (++i < m) {
-      bin = bins[i] = [];
-      bin.dx = thresholds[i + 1] - (bin.x = thresholds[i]);
-      bin.y = 0;
-    }
-
-    // Fill the bins, ignoring values outside the range.
-    i = -1; while(++i < n) {
-      x = values[i];
-      if ((x >= range[0]) && (x <= range[1])) {
-        bin = bins[d3.bisect(thresholds, x, 1, m) - 1];
-        bin.y += k;
-        bin.push(data[i]);
-      }
-    }
-
-    return bins;
-  }
-
-  // Specifies how to extract a value from the associated data. The default
-  // value function is `Number`, which is equivalent to the identity function.
-  histogram.value = function(x) {
-    if (!arguments.length) return valuer;
-    valuer = x;
-    return histogram;
-  };
-
-  // Specifies the range of the histogram. Values outside the specified range
-  // will be ignored. The argument `x` may be specified either as a two-element
-  // array representing the minimum and maximum value of the range, or as a
-  // function that returns the range given the array of values and the current
-  // index `i`. The default range is the extent (minimum and maximum) of the
-  // values.
-  histogram.range = function(x) {
-    if (!arguments.length) return ranger;
-    ranger = d3.functor(x);
-    return histogram;
-  };
-
-  // Specifies how to bin values in the histogram. The argument `x` may be
-  // specified as a number, in which case the range of values will be split
-  // uniformly into the given number of bins. Or, `x` may be an array of
-  // threshold values, defining the bins; the specified array must contain the
-  // rightmost (upper) value, thus specifying n + 1 values for n bins. Or, `x`
-  // may be a function which is evaluated, being passed the range, the array of
-  // values, and the current index `i`, returning an array of thresholds. The
-  // default bin function will divide the values into uniform bins using
-  // Sturges' formula.
-  histogram.bins = function(x) {
-    if (!arguments.length) return binner;
-    binner = typeof x === "number"
-        ? function(range) { return d3_layout_histogramBinFixed(range, x); }
-        : d3.functor(x);
-    return histogram;
-  };
-
-  // Specifies whether the histogram's `y` value is a count (frequency) or a
-  // probability (density). The default value is true.
-  histogram.frequency = function(x) {
-    if (!arguments.length) return frequency;
-    frequency = !!x;
-    return histogram;
-  };
-
-  return histogram;
-};
-
-function d3_layout_histogramBinSturges(range, values) {
-  return d3_layout_histogramBinFixed(range, Math.ceil(Math.log(values.length) / Math.LN2 + 1));
-}
-
-function d3_layout_histogramBinFixed(range, n) {
-  var x = -1,
-      b = +range[0],
-      m = (range[1] - b) / n,
-      f = [];
-  while (++x <= n) f[x] = m * x + b;
-  return f;
-}
-
-function d3_layout_histogramRange(values) {
-  return [d3.min(values), d3.max(values)];
-}
-d3.layout.hierarchy = function() {
-  var sort = d3_layout_hierarchySort,
-      children = d3_layout_hierarchyChildren,
-      value = d3_layout_hierarchyValue;
-
-  // Recursively compute the node depth and value.
-  // Also converts the data representation into a standard hierarchy structure.
-  function recurse(data, depth, nodes) {
-    var childs = children.call(hierarchy, data, depth),
-        node = d3_layout_hierarchyInline ? data : {data: data};
-    node.depth = depth;
-    nodes.push(node);
-    if (childs && (n = childs.length)) {
-      var i = -1,
-          n,
-          c = node.children = [],
-          v = 0,
-          j = depth + 1;
-      while (++i < n) {
-        d = recurse(childs[i], j, nodes);
-        d.parent = node;
-        c.push(d);
-        v += d.value;
-      }
-      if (sort) c.sort(sort);
-      if (value) node.value = v;
-    } else if (value) {
-      node.value = +value.call(hierarchy, data, depth) || 0;
-    }
-    return node;
-  }
-
-  // Recursively re-evaluates the node value.
-  function revalue(node, depth) {
-    var children = node.children,
-        v = 0;
-    if (children && (n = children.length)) {
-      var i = -1,
-          n,
-          j = depth + 1;
-      while (++i < n) v += revalue(children[i], j);
-    } else if (value) {
-      v = +value.call(hierarchy, d3_layout_hierarchyInline ? node : node.data, depth) || 0;
-    }
-    if (value) node.value = v;
-    return v;
-  }
-
-  function hierarchy(d) {
-    var nodes = [];
-    recurse(d, 0, nodes);
-    return nodes;
-  }
-
-  hierarchy.sort = function(x) {
-    if (!arguments.length) return sort;
-    sort = x;
-    return hierarchy;
-  };
-
-  hierarchy.children = function(x) {
-    if (!arguments.length) return children;
-    children = x;
-    return hierarchy;
-  };
-
-  hierarchy.value = function(x) {
-    if (!arguments.length) return value;
-    value = x;
-    return hierarchy;
-  };
-
-  // Re-evaluates the `value` property for the specified hierarchy.
-  hierarchy.revalue = function(root) {
-    revalue(root, 0);
-    return root;
-  };
-
-  return hierarchy;
-};
-
-// A method assignment helper for hierarchy subclasses.
-function d3_layout_hierarchyRebind(object, hierarchy) {
-  d3.rebind(object, hierarchy, "sort", "children", "value");
-
-  // Add an alias for links, for convenience.
-  object.links = d3_layout_hierarchyLinks;
-
-  // If the new API is used, enabling inlining.
-  object.nodes = function(d) {
-    d3_layout_hierarchyInline = true;
-    return (object.nodes = object)(d);
-  };
-
-  return object;
-}
-
-function d3_layout_hierarchyChildren(d) {
-  return d.children;
-}
-
-function d3_layout_hierarchyValue(d) {
-  return d.value;
-}
-
-function d3_layout_hierarchySort(a, b) {
-  return b.value - a.value;
-}
-
-// Returns an array source+target objects for the specified nodes.
-function d3_layout_hierarchyLinks(nodes) {
-  return d3.merge(nodes.map(function(parent) {
-    return (parent.children || []).map(function(child) {
-      return {source: parent, target: child};
-    });
-  }));
-}
-
-// For backwards-compatibility, don't enable inlining by default.
-var d3_layout_hierarchyInline = false;
-d3.layout.pack = function() {
-  var hierarchy = d3.layout.hierarchy().sort(d3_layout_packSort),
-      size = [1, 1];
-
-  function pack(d, i) {
-    var nodes = hierarchy.call(this, d, i),
-        root = nodes[0];
-
-    // Recursively compute the layout.
-    root.x = 0;
-    root.y = 0;
-    d3_layout_packTree(root);
-
-    // Scale the layout to fit the requested size.
-    var w = size[0],
-        h = size[1],
-        k = 1 / Math.max(2 * root.r / w, 2 * root.r / h);
-    d3_layout_packTransform(root, w / 2, h / 2, k);
-
-    return nodes;
-  }
-
-  pack.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return pack;
-  };
-
-  return d3_layout_hierarchyRebind(pack, hierarchy);
-};
-
-function d3_layout_packSort(a, b) {
-  return a.value - b.value;
-}
-
-function d3_layout_packInsert(a, b) {
-  var c = a._pack_next;
-  a._pack_next = b;
-  b._pack_prev = a;
-  b._pack_next = c;
-  c._pack_prev = b;
-}
-
-function d3_layout_packSplice(a, b) {
-  a._pack_next = b;
-  b._pack_prev = a;
-}
-
-function d3_layout_packIntersects(a, b) {
-  var dx = b.x - a.x,
-      dy = b.y - a.y,
-      dr = a.r + b.r;
-  return dr * dr - dx * dx - dy * dy > .001; // within epsilon
-}
-
-function d3_layout_packCircle(nodes) {
-  var xMin = Infinity,
-      xMax = -Infinity,
-      yMin = Infinity,
-      yMax = -Infinity,
-      n = nodes.length,
-      a, b, c, j, k;
-
-  function bound(node) {
-    xMin = Math.min(node.x - node.r, xMin);
-    xMax = Math.max(node.x + node.r, xMax);
-    yMin = Math.min(node.y - node.r, yMin);
-    yMax = Math.max(node.y + node.r, yMax);
-  }
-
-  // Create node links.
-  nodes.forEach(d3_layout_packLink);
-
-  // Create first node.
-  a = nodes[0];
-  a.x = -a.r;
-  a.y = 0;
-  bound(a);
-
-  // Create second node.
-  if (n > 1) {
-    b = nodes[1];
-    b.x = b.r;
-    b.y = 0;
-    bound(b);
-
-    // Create third node and build chain.
-    if (n > 2) {
-      c = nodes[2];
-      d3_layout_packPlace(a, b, c);
-      bound(c);
-      d3_layout_packInsert(a, c);
-      a._pack_prev = c;
-      d3_layout_packInsert(c, b);
-      b = a._pack_next;
-
-      // Now iterate through the rest.
-      for (var i = 3; i < n; i++) {
-        d3_layout_packPlace(a, b, c = nodes[i]);
-
-        // Search for the closest intersection.
-        var isect = 0, s1 = 1, s2 = 1;
-        for (j = b._pack_next; j !== b; j = j._pack_next, s1++) {
-          if (d3_layout_packIntersects(j, c)) {
-            isect = 1;
-            break;
-          }
-        }
-        if (isect == 1) {
-          for (k = a._pack_prev; k !== j._pack_prev; k = k._pack_prev, s2++) {
-            if (d3_layout_packIntersects(k, c)) {
-              break;
-            }
-          }
-        }
-
-        // Update node chain.
-        if (isect) {
-          if (s1 < s2 || (s1 == s2 && b.r < a.r)) d3_layout_packSplice(a, b = j);
-          else d3_layout_packSplice(a = k, b);
-          i--;
-        } else {
-          d3_layout_packInsert(a, c);
-          b = c;
-          bound(c);
-        }
-      }
-    }
-  }
-
-  // Re-center the circles and return the encompassing radius.
-  var cx = (xMin + xMax) / 2,
-      cy = (yMin + yMax) / 2,
-      cr = 0;
-  for (var i = 0; i < n; i++) {
-    var node = nodes[i];
-    node.x -= cx;
-    node.y -= cy;
-    cr = Math.max(cr, node.r + Math.sqrt(node.x * node.x + node.y * node.y));
-  }
-
-  // Remove node links.
-  nodes.forEach(d3_layout_packUnlink);
-
-  return cr;
-}
-
-function d3_layout_packLink(node) {
-  node._pack_next = node._pack_prev = node;
-}
-
-function d3_layout_packUnlink(node) {
-  delete node._pack_next;
-  delete node._pack_prev;
-}
-
-function d3_layout_packTree(node) {
-  var children = node.children;
-  if (children && children.length) {
-    children.forEach(d3_layout_packTree);
-    node.r = d3_layout_packCircle(children);
-  } else {
-    node.r = Math.sqrt(node.value);
-  }
-}
-
-function d3_layout_packTransform(node, x, y, k) {
-  var children = node.children;
-  node.x = (x += k * node.x);
-  node.y = (y += k * node.y);
-  node.r *= k;
-  if (children) {
-    var i = -1, n = children.length;
-    while (++i < n) d3_layout_packTransform(children[i], x, y, k);
-  }
-}
-
-function d3_layout_packPlace(a, b, c) {
-  var db = a.r + c.r,
-      dx = b.x - a.x,
-      dy = b.y - a.y;
-  if (db && (dx || dy)) {
-    var da = b.r + c.r,
-        dc = Math.sqrt(dx * dx + dy * dy),
-        cos = Math.max(-1, Math.min(1, (db * db + dc * dc - da * da) / (2 * db * dc))),
-        theta = Math.acos(cos),
-        x = cos * (db /= dc),
-        y = Math.sin(theta) * db;
-    c.x = a.x + x * dx + y * dy;
-    c.y = a.y + x * dy - y * dx;
-  } else {
-    c.x = a.x + db;
-    c.y = a.y;
-  }
-}
-// Implements a hierarchical layout using the cluster (or dendogram) algorithm.
-d3.layout.cluster = function() {
-  var hierarchy = d3.layout.hierarchy().sort(null).value(null),
-      separation = d3_layout_treeSeparation,
-      size = [1, 1]; // width, height
-
-  function cluster(d, i) {
-    var nodes = hierarchy.call(this, d, i),
-        root = nodes[0],
-        previousNode,
-        x = 0,
-        kx,
-        ky;
-
-    // First walk, computing the initial x & y values.
-    d3_layout_treeVisitAfter(root, function(node) {
-      var children = node.children;
-      if (children && children.length) {
-        node.x = d3_layout_clusterX(children);
-        node.y = d3_layout_clusterY(children);
-      } else {
-        node.x = previousNode ? x += separation(node, previousNode) : 0;
-        node.y = 0;
-        previousNode = node;
-      }
-    });
-
-    // Compute the left-most, right-most, and depth-most nodes for extents.
-    var left = d3_layout_clusterLeft(root),
-        right = d3_layout_clusterRight(root),
-        x0 = left.x - separation(left, right) / 2,
-        x1 = right.x + separation(right, left) / 2;
-
-    // Second walk, normalizing x & y to the desired size.
-    d3_layout_treeVisitAfter(root, function(node) {
-      node.x = (node.x - x0) / (x1 - x0) * size[0];
-      node.y = (1 - (root.y ? node.y / root.y : 1)) * size[1];
-    });
-
-    return nodes;
-  }
-
-  cluster.separation = function(x) {
-    if (!arguments.length) return separation;
-    separation = x;
-    return cluster;
-  };
-
-  cluster.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return cluster;
-  };
-
-  return d3_layout_hierarchyRebind(cluster, hierarchy);
-};
-
-function d3_layout_clusterY(children) {
-  return 1 + d3.max(children, function(child) {
-    return child.y;
-  });
-}
-
-function d3_layout_clusterX(children) {
-  return children.reduce(function(x, child) {
-    return x + child.x;
-  }, 0) / children.length;
-}
-
-function d3_layout_clusterLeft(node) {
-  var children = node.children;
-  return children && children.length ? d3_layout_clusterLeft(children[0]) : node;
-}
-
-function d3_layout_clusterRight(node) {
-  var children = node.children, n;
-  return children && (n = children.length) ? d3_layout_clusterRight(children[n - 1]) : node;
-}
-// Node-link tree diagram using the Reingold-Tilford "tidy" algorithm
-d3.layout.tree = function() {
-  var hierarchy = d3.layout.hierarchy().sort(null).value(null),
-      separation = d3_layout_treeSeparation,
-      size = [1, 1]; // width, height
-
-  function tree(d, i) {
-    var nodes = hierarchy.call(this, d, i),
-        root = nodes[0];
-
-    function firstWalk(node, previousSibling) {
-      var children = node.children,
-          layout = node._tree;
-      if (children && (n = children.length)) {
-        var n,
-            firstChild = children[0],
-            previousChild,
-            ancestor = firstChild,
-            child,
-            i = -1;
-        while (++i < n) {
-          child = children[i];
-          firstWalk(child, previousChild);
-          ancestor = apportion(child, previousChild, ancestor);
-          previousChild = child;
-        }
-        d3_layout_treeShift(node);
-        var midpoint = .5 * (firstChild._tree.prelim + child._tree.prelim);
-        if (previousSibling) {
-          layout.prelim = previousSibling._tree.prelim + separation(node, previousSibling);
-          layout.mod = layout.prelim - midpoint;
-        } else {
-          layout.prelim = midpoint;
-        }
-      } else {
-        if (previousSibling) {
-          layout.prelim = previousSibling._tree.prelim + separation(node, previousSibling);
-        }
-      }
-    }
-
-    function secondWalk(node, x) {
-      node.x = node._tree.prelim + x;
-      var children = node.children;
-      if (children && (n = children.length)) {
-        var i = -1,
-            n;
-        x += node._tree.mod;
-        while (++i < n) {
-          secondWalk(children[i], x);
-        }
-      }
-    }
-
-    function apportion(node, previousSibling, ancestor) {
-      if (previousSibling) {
-        var vip = node,
-            vop = node,
-            vim = previousSibling,
-            vom = node.parent.children[0],
-            sip = vip._tree.mod,
-            sop = vop._tree.mod,
-            sim = vim._tree.mod,
-            som = vom._tree.mod,
-            shift;
-        while (vim = d3_layout_treeRight(vim), vip = d3_layout_treeLeft(vip), vim && vip) {
-          vom = d3_layout_treeLeft(vom);
-          vop = d3_layout_treeRight(vop);
-          vop._tree.ancestor = node;
-          shift = vim._tree.prelim + sim - vip._tree.prelim - sip + separation(vim, vip);
-          if (shift > 0) {
-            d3_layout_treeMove(d3_layout_treeAncestor(vim, node, ancestor), node, shift);
-            sip += shift;
-            sop += shift;
-          }
-          sim += vim._tree.mod;
-          sip += vip._tree.mod;
-          som += vom._tree.mod;
-          sop += vop._tree.mod;
-        }
-        if (vim && !d3_layout_treeRight(vop)) {
-          vop._tree.thread = vim;
-          vop._tree.mod += sim - sop;
-        }
-        if (vip && !d3_layout_treeLeft(vom)) {
-          vom._tree.thread = vip;
-          vom._tree.mod += sip - som;
-          ancestor = node;
-        }
-      }
-      return ancestor;
-    }
-
-    // Initialize temporary layout variables.
-    d3_layout_treeVisitAfter(root, function(node, previousSibling) {
-      node._tree = {
-        ancestor: node,
-        prelim: 0,
-        mod: 0,
-        change: 0,
-        shift: 0,
-        number: previousSibling ? previousSibling._tree.number + 1 : 0
-      };
-    });
-
-    // Compute the layout using Buchheim et al.'s algorithm.
-    firstWalk(root);
-    secondWalk(root, -root._tree.prelim);
-
-    // Compute the left-most, right-most, and depth-most nodes for extents.
-    var left = d3_layout_treeSearch(root, d3_layout_treeLeftmost),
-        right = d3_layout_treeSearch(root, d3_layout_treeRightmost),
-        deep = d3_layout_treeSearch(root, d3_layout_treeDeepest),
-        x0 = left.x - separation(left, right) / 2,
-        x1 = right.x + separation(right, left) / 2,
-        y1 = deep.depth || 1;
-
-    // Clear temporary layout variables; transform x and y.
-    d3_layout_treeVisitAfter(root, function(node) {
-      node.x = (node.x - x0) / (x1 - x0) * size[0];
-      node.y = node.depth / y1 * size[1];
-      delete node._tree;
-    });
-
-    return nodes;
-  }
-
-  tree.separation = function(x) {
-    if (!arguments.length) return separation;
-    separation = x;
-    return tree;
-  };
-
-  tree.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return tree;
-  };
-
-  return d3_layout_hierarchyRebind(tree, hierarchy);
-};
-
-function d3_layout_treeSeparation(a, b) {
-  return a.parent == b.parent ? 1 : 2;
-}
-
-// function d3_layout_treeSeparationRadial(a, b) {
-//   return (a.parent == b.parent ? 1 : 2) / a.depth;
-// }
-
-function d3_layout_treeLeft(node) {
-  var children = node.children;
-  return children && children.length ? children[0] : node._tree.thread;
-}
-
-function d3_layout_treeRight(node) {
-  var children = node.children,
-      n;
-  return children && (n = children.length) ? children[n - 1] : node._tree.thread;
-}
-
-function d3_layout_treeSearch(node, compare) {
-  var children = node.children;
-  if (children && (n = children.length)) {
-    var child,
-        n,
-        i = -1;
-    while (++i < n) {
-      if (compare(child = d3_layout_treeSearch(children[i], compare), node) > 0) {
-        node = child;
-      }
-    }
-  }
-  return node;
-}
-
-function d3_layout_treeRightmost(a, b) {
-  return a.x - b.x;
-}
-
-function d3_layout_treeLeftmost(a, b) {
-  return b.x - a.x;
-}
-
-function d3_layout_treeDeepest(a, b) {
-  return a.depth - b.depth;
-}
-
-function d3_layout_treeVisitAfter(node, callback) {
-  function visit(node, previousSibling) {
-    var children = node.children;
-    if (children && (n = children.length)) {
-      var child,
-          previousChild = null,
-          i = -1,
-          n;
-      while (++i < n) {
-        child = children[i];
-        visit(child, previousChild);
-        previousChild = child;
-      }
-    }
-    callback(node, previousSibling);
-  }
-  visit(node, null);
-}
-
-function d3_layout_treeShift(node) {
-  var shift = 0,
-      change = 0,
-      children = node.children,
-      i = children.length,
-      child;
-  while (--i >= 0) {
-    child = children[i]._tree;
-    child.prelim += shift;
-    child.mod += shift;
-    shift += child.shift + (change += child.change);
-  }
-}
-
-function d3_layout_treeMove(ancestor, node, shift) {
-  ancestor = ancestor._tree;
-  node = node._tree;
-  var change = shift / (node.number - ancestor.number);
-  ancestor.change += change;
-  node.change -= change;
-  node.shift += shift;
-  node.prelim += shift;
-  node.mod += shift;
-}
-
-function d3_layout_treeAncestor(vim, node, ancestor) {
-  return vim._tree.ancestor.parent == node.parent
-      ? vim._tree.ancestor
-      : ancestor;
-}
-// Squarified Treemaps by Mark Bruls, Kees Huizing, and Jarke J. van Wijk
-// Modified to support a target aspect ratio by Jeff Heer
-d3.layout.treemap = function() {
-  var hierarchy = d3.layout.hierarchy(),
-      round = Math.round,
-      size = [1, 1], // width, height
-      padding = null,
-      pad = d3_layout_treemapPadNull,
-      sticky = false,
-      stickies,
-      ratio = 0.5 * (1 + Math.sqrt(5)); // golden ratio
-
-  // Compute the area for each child based on value & scale.
-  function scale(children, k) {
-    var i = -1,
-        n = children.length,
-        child,
-        area;
-    while (++i < n) {
-      area = (child = children[i]).value * (k < 0 ? 0 : k);
-      child.area = isNaN(area) || area <= 0 ? 0 : area;
-    }
-  }
-
-  // Recursively arranges the specified node's children into squarified rows.
-  function squarify(node) {
-    var children = node.children;
-    if (children && children.length) {
-      var rect = pad(node),
-          row = [],
-          remaining = children.slice(), // copy-on-write
-          child,
-          best = Infinity, // the best row score so far
-          score, // the current row score
-          u = Math.min(rect.dx, rect.dy), // initial orientation
-          n;
-      scale(remaining, rect.dx * rect.dy / node.value);
-      row.area = 0;
-      while ((n = remaining.length) > 0) {
-        row.push(child = remaining[n - 1]);
-        row.area += child.area;
-        if ((score = worst(row, u)) <= best) { // continue with this orientation
-          remaining.pop();
-          best = score;
-        } else { // abort, and try a different orientation
-          row.area -= row.pop().area;
-          position(row, u, rect, false);
-          u = Math.min(rect.dx, rect.dy);
-          row.length = row.area = 0;
-          best = Infinity;
-        }
-      }
-      if (row.length) {
-        position(row, u, rect, true);
-        row.length = row.area = 0;
-      }
-      children.forEach(squarify);
-    }
-  }
-
-  // Recursively resizes the specified node's children into existing rows.
-  // Preserves the existing layout!
-  function stickify(node) {
-    var children = node.children;
-    if (children && children.length) {
-      var rect = pad(node),
-          remaining = children.slice(), // copy-on-write
-          child,
-          row = [];
-      scale(remaining, rect.dx * rect.dy / node.value);
-      row.area = 0;
-      while (child = remaining.pop()) {
-        row.push(child);
-        row.area += child.area;
-        if (child.z != null) {
-          position(row, child.z ? rect.dx : rect.dy, rect, !remaining.length);
-          row.length = row.area = 0;
-        }
-      }
-      children.forEach(stickify);
-    }
-  }
-
-  // Computes the score for the specified row, as the worst aspect ratio.
-  function worst(row, u) {
-    var s = row.area,
-        r,
-        rmax = 0,
-        rmin = Infinity,
-        i = -1,
-        n = row.length;
-    while (++i < n) {
-      if (!(r = row[i].area)) continue;
-      if (r < rmin) rmin = r;
-      if (r > rmax) rmax = r;
-    }
-    s *= s;
-    u *= u;
-    return s
-        ? Math.max((u * rmax * ratio) / s, s / (u * rmin * ratio))
-        : Infinity;
-  }
-
-  // Positions the specified row of nodes. Modifies `rect`.
-  function position(row, u, rect, flush) {
-    var i = -1,
-        n = row.length,
-        x = rect.x,
-        y = rect.y,
-        v = u ? round(row.area / u) : 0,
-        o;
-    if (u == rect.dx) { // horizontal subdivision
-      if (flush || v > rect.dy) v = v ? rect.dy : 0; // over+underflow
-      while (++i < n) {
-        o = row[i];
-        o.x = x;
-        o.y = y;
-        o.dy = v;
-        x += o.dx = v ? round(o.area / v) : 0;
-      }
-      o.z = true;
-      o.dx += rect.x + rect.dx - x; // rounding error
-      rect.y += v;
-      rect.dy -= v;
-    } else { // vertical subdivision
-      if (flush || v > rect.dx) v = v ? rect.dx : 0; // over+underflow
-      while (++i < n) {
-        o = row[i];
-        o.x = x;
-        o.y = y;
-        o.dx = v;
-        y += o.dy = v ? round(o.area / v) : 0;
-      }
-      o.z = false;
-      o.dy += rect.y + rect.dy - y; // rounding error
-      rect.x += v;
-      rect.dx -= v;
-    }
-  }
-
-  function treemap(d) {
-    var nodes = stickies || hierarchy(d),
-        root = nodes[0];
-    root.x = 0;
-    root.y = 0;
-    root.dx = size[0];
-    root.dy = size[1];
-    if (stickies) hierarchy.revalue(root);
-    scale([root], root.dx * root.dy / root.value);
-    (stickies ? stickify : squarify)(root);
-    if (sticky) stickies = nodes;
-    return nodes;
-  }
-
-  treemap.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return treemap;
-  };
-
-  treemap.padding = function(x) {
-    if (!arguments.length) return padding;
-
-    function padFunction(node) {
-      var p = x.call(treemap, node, node.depth);
-      return p == null
-          ? d3_layout_treemapPadNull(node)
-          : d3_layout_treemapPad(node, typeof p === "number" ? [p, p, p, p] : p);
-    }
-
-    function padConstant(node) {
-      return d3_layout_treemapPad(node, x);
-    }
-
-    var type;
-    pad = (padding = x) == null ? d3_layout_treemapPadNull
-        : (type = typeof x) === "function" ? padFunction
-        : type === "number" ? (x = [x, x, x, x], padConstant)
-        : padConstant;
-    return treemap;
-  };
-
-  treemap.round = function(x) {
-    if (!arguments.length) return round != Number;
-    round = x ? Math.round : Number;
-    return treemap;
-  };
-
-  treemap.sticky = function(x) {
-    if (!arguments.length) return sticky;
-    sticky = x;
-    stickies = null;
-    return treemap;
-  };
-
-  treemap.ratio = function(x) {
-    if (!arguments.length) return ratio;
-    ratio = x;
-    return treemap;
-  };
-
-  return d3_layout_hierarchyRebind(treemap, hierarchy);
-};
-
-function d3_layout_treemapPadNull(node) {
-  return {x: node.x, y: node.y, dx: node.dx, dy: node.dy};
-}
-
-function d3_layout_treemapPad(node, padding) {
-  var x = node.x + padding[3],
-      y = node.y + padding[0],
-      dx = node.dx - padding[1] - padding[3],
-      dy = node.dy - padding[0] - padding[2];
-  if (dx < 0) { x += dx / 2; dx = 0; }
-  if (dy < 0) { y += dy / 2; dy = 0; }
-  return {x: x, y: y, dx: dx, dy: dy};
-}
-})();
diff --git a/visualize/static/d3.layout.min.js b/visualize/static/d3.layout.min.js
deleted file mode 100644
index 689cc706..00000000
--- a/visualize/static/d3.layout.min.js
+++ /dev/null
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\ No newline at end of file
diff --git a/visualize/static/d3.v2.js b/visualize/static/d3.v2.js
new file mode 100644
index 00000000..c1b6caf2
--- /dev/null
+++ b/visualize/static/d3.v2.js
@@ -0,0 +1,9342 @@
+(function(){if (!Date.now) Date.now = function() {
+  return +new Date;
+};
+try {
+  document.createElement("div").style.setProperty("opacity", 0, "");
+} catch (error) {
+  var d3_style_prototype = CSSStyleDeclaration.prototype,
+      d3_style_setProperty = d3_style_prototype.setProperty;
+  d3_style_prototype.setProperty = function(name, value, priority) {
+    d3_style_setProperty.call(this, name, value + "", priority);
+  };
+}
+d3 = {version: "2.8.1"}; // semver
+function d3_class(ctor, properties) {
+  try {
+    for (var key in properties) {
+      Object.defineProperty(ctor.prototype, key, {
+        value: properties[key],
+        enumerable: false
+      });
+    }
+  } catch (e) {
+    ctor.prototype = properties;
+  }
+}
+var d3_array = d3_arraySlice; // conversion for NodeLists
+
+function d3_arrayCopy(pseudoarray) {
+  var i = -1, n = pseudoarray.length, array = [];
+  while (++i < n) array.push(pseudoarray[i]);
+  return array;
+}
+
+function d3_arraySlice(pseudoarray) {
+  return Array.prototype.slice.call(pseudoarray);
+}
+
+try {
+  d3_array(document.documentElement.childNodes)[0].nodeType;
+} catch(e) {
+  d3_array = d3_arrayCopy;
+}
+
+var d3_arraySubclass = [].__proto__?
+
+// Until ECMAScript supports array subclassing, prototype injection works well.
+function(array, prototype) {
+  array.__proto__ = prototype;
+}:
+
+// And if your browser doesn't support __proto__, we'll use direct extension.
+function(array, prototype) {
+  for (var property in prototype) array[property] = prototype[property];
+};
+d3.map = function(object) {
+  var map = new d3_Map;
+  for (var key in object) map.set(key, object[key]);
+  return map;
+};
+
+function d3_Map() {}
+
+d3_class(d3_Map, {
+  has: function(key) {
+    return d3_map_prefix + key in this;
+  },
+  get: function(key) {
+    return this[d3_map_prefix + key];
+  },
+  set: function(key, value) {
+    return this[d3_map_prefix + key] = value;
+  },
+  remove: function(key) {
+    key = d3_map_prefix + key;
+    return key in this && delete this[key];
+  },
+  keys: function() {
+    var keys = [];
+    this.forEach(function(key) { keys.push(key); });
+    return keys;
+  },
+  values: function() {
+    var values = [];
+    this.forEach(function(key, value) { values.push(value); });
+    return values;
+  },
+  entries: function() {
+    var entries = [];
+    this.forEach(function(key, value) { entries.push({key: key, value: value}); });
+    return entries;
+  },
+  forEach: function(f) {
+    for (var key in this) {
+      if (key.charCodeAt(0) === d3_map_prefixCode) {
+        f.call(this, key.substring(1), this[key]);
+      }
+    }
+  }
+});
+
+var d3_map_prefix = "\0", // prevent collision with built-ins
+    d3_map_prefixCode = d3_map_prefix.charCodeAt(0);
+function d3_this() {
+  return this;
+}
+d3.functor = function(v) {
+  return typeof v === "function" ? v : function() { return v; };
+};
+// Copies a variable number of methods from source to target.
+d3.rebind = function(target, source) {
+  var i = 1, n = arguments.length, method;
+  while (++i < n) target[method = arguments[i]] = d3_rebind(target, source, source[method]);
+  return target;
+};
+
+// Method is assumed to be a standard D3 getter-setter:
+// If passed with no arguments, gets the value.
+// If passed with arguments, sets the value and returns the target.
+function d3_rebind(target, source, method) {
+  return function() {
+    var value = method.apply(source, arguments);
+    return arguments.length ? target : value;
+  };
+}
+d3.ascending = function(a, b) {
+  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
+};
+d3.descending = function(a, b) {
+  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
+};
+d3.mean = function(array, f) {
+  var n = array.length,
+      a,
+      m = 0,
+      i = -1,
+      j = 0;
+  if (arguments.length === 1) {
+    while (++i < n) if (d3_number(a = array[i])) m += (a - m) / ++j;
+  } else {
+    while (++i < n) if (d3_number(a = f.call(array, array[i], i))) m += (a - m) / ++j;
+  }
+  return j ? m : undefined;
+};
+d3.median = function(array, f) {
+  if (arguments.length > 1) array = array.map(f);
+  array = array.filter(d3_number);
+  return array.length ? d3.quantile(array.sort(d3.ascending), .5) : undefined;
+};
+d3.min = function(array, f) {
+  var i = -1,
+      n = array.length,
+      a,
+      b;
+  if (arguments.length === 1) {
+    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
+    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
+  } else {
+    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
+    while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
+  }
+  return a;
+};
+d3.max = function(array, f) {
+  var i = -1,
+      n = array.length,
+      a,
+      b;
+  if (arguments.length === 1) {
+    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
+    while (++i < n) if ((b = array[i]) != null && b > a) a = b;
+  } else {
+    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
+    while (++i < n) if ((b = f.call(array, array[i], i)) != null && b > a) a = b;
+  }
+  return a;
+};
+d3.extent = function(array, f) {
+  var i = -1,
+      n = array.length,
+      a,
+      b,
+      c;
+  if (arguments.length === 1) {
+    while (++i < n && ((a = c = array[i]) == null || a != a)) a = c = undefined;
+    while (++i < n) if ((b = array[i]) != null) {
+      if (a > b) a = b;
+      if (c < b) c = b;
+    }
+  } else {
+    while (++i < n && ((a = c = f.call(array, array[i], i)) == null || a != a)) a = undefined;
+    while (++i < n) if ((b = f.call(array, array[i], i)) != null) {
+      if (a > b) a = b;
+      if (c < b) c = b;
+    }
+  }
+  return [a, c];
+};
+d3.random = {
+  normal: function(mean, deviation) {
+    if (arguments.length < 2) deviation = 1;
+    if (arguments.length < 1) mean = 0;
+    return function() {
+      var x, y, r;
+      do {
+        x = Math.random() * 2 - 1;
+        y = Math.random() * 2 - 1;
+        r = x * x + y * y;
+      } while (!r || r > 1);
+      return mean + deviation * x * Math.sqrt(-2 * Math.log(r) / r);
+    };
+  }
+};
+function d3_number(x) {
+  return x != null && !isNaN(x);
+}
+d3.sum = function(array, f) {
+  var s = 0,
+      n = array.length,
+      a,
+      i = -1;
+
+  if (arguments.length === 1) {
+    while (++i < n) if (!isNaN(a = +array[i])) s += a;
+  } else {
+    while (++i < n) if (!isNaN(a = +f.call(array, array[i], i))) s += a;
+  }
+
+  return s;
+};
+// R-7 per <http://en.wikipedia.org/wiki/Quantile>
+d3.quantile = function(values, p) {
+  var H = (values.length - 1) * p + 1,
+      h = Math.floor(H),
+      v = values[h - 1],
+      e = H - h;
+  return e ? v + e * (values[h] - v) : v;
+};
+d3.transpose = function(matrix) {
+  return d3.zip.apply(d3, matrix);
+};
+d3.zip = function() {
+  if (!(n = arguments.length)) return [];
+  for (var i = -1, m = d3.min(arguments, d3_zipLength), zips = new Array(m); ++i < m;) {
+    for (var j = -1, n, zip = zips[i] = new Array(n); ++j < n;) {
+      zip[j] = arguments[j][i];
+    }
+  }
+  return zips;
+};
+
+function d3_zipLength(d) {
+  return d.length;
+}
+d3.bisector = function(f) {
+  return {
+    left: function(a, x, lo, hi) {
+      if (arguments.length < 3) lo = 0;
+      if (arguments.length < 4) hi = a.length;
+      while (lo < hi) {
+        var mid = lo + hi >> 1;
+        if (f.call(a, a[mid], mid) < x) lo = mid + 1;
+        else hi = mid;
+      }
+      return lo;
+    },
+    right: function(a, x, lo, hi) {
+      if (arguments.length < 3) lo = 0;
+      if (arguments.length < 4) hi = a.length;
+      while (lo < hi) {
+        var mid = lo + hi >> 1;
+        if (x < f.call(a, a[mid], mid)) hi = mid;
+        else lo = mid + 1;
+      }
+      return lo;
+    }
+  };
+};
+
+var d3_bisector = d3.bisector(function(d) { return d; });
+d3.bisectLeft = d3_bisector.left;
+d3.bisect = d3.bisectRight = d3_bisector.right;
+d3.first = function(array, f) {
+  var i = 0,
+      n = array.length,
+      a = array[0],
+      b;
+  if (arguments.length === 1) f = d3.ascending;
+  while (++i < n) {
+    if (f.call(array, a, b = array[i]) > 0) {
+      a = b;
+    }
+  }
+  return a;
+};
+d3.last = function(array, f) {
+  var i = 0,
+      n = array.length,
+      a = array[0],
+      b;
+  if (arguments.length === 1) f = d3.ascending;
+  while (++i < n) {
+    if (f.call(array, a, b = array[i]) <= 0) {
+      a = b;
+    }
+  }
+  return a;
+};
+d3.nest = function() {
+  var nest = {},
+      keys = [],
+      sortKeys = [],
+      sortValues,
+      rollup;
+
+  function map(array, depth) {
+    if (depth >= keys.length) return rollup
+        ? rollup.call(nest, array) : (sortValues
+        ? array.sort(sortValues)
+        : array);
+
+    var i = -1,
+        n = array.length,
+        key = keys[depth++],
+        keyValue,
+        object,
+        valuesByKey = new d3_Map,
+        values,
+        o = {};
+
+    while (++i < n) {
+      if (values = valuesByKey.get(keyValue = key(object = array[i]))) {
+        values.push(object);
+      } else {
+        valuesByKey.set(keyValue, [object]);
+      }
+    }
+
+    valuesByKey.forEach(function(keyValue) {
+      o[keyValue] = map(valuesByKey.get(keyValue), depth);
+    });
+
+    return o;
+  }
+
+  function entries(map, depth) {
+    if (depth >= keys.length) return map;
+
+    var a = [],
+        sortKey = sortKeys[depth++],
+        key;
+
+    for (key in map) {
+      a.push({key: key, values: entries(map[key], depth)});
+    }
+
+    if (sortKey) a.sort(function(a, b) {
+      return sortKey(a.key, b.key);
+    });
+
+    return a;
+  }
+
+  nest.map = function(array) {
+    return map(array, 0);
+  };
+
+  nest.entries = function(array) {
+    return entries(map(array, 0), 0);
+  };
+
+  nest.key = function(d) {
+    keys.push(d);
+    return nest;
+  };
+
+  // Specifies the order for the most-recently specified key.
+  // Note: only applies to entries. Map keys are unordered!
+  nest.sortKeys = function(order) {
+    sortKeys[keys.length - 1] = order;
+    return nest;
+  };
+
+  // Specifies the order for leaf values.
+  // Applies to both maps and entries array.
+  nest.sortValues = function(order) {
+    sortValues = order;
+    return nest;
+  };
+
+  nest.rollup = function(f) {
+    rollup = f;
+    return nest;
+  };
+
+  return nest;
+};
+d3.keys = function(map) {
+  var keys = [];
+  for (var key in map) keys.push(key);
+  return keys;
+};
+d3.values = function(map) {
+  var values = [];
+  for (var key in map) values.push(map[key]);
+  return values;
+};
+d3.entries = function(map) {
+  var entries = [];
+  for (var key in map) entries.push({key: key, value: map[key]});
+  return entries;
+};
+d3.permute = function(array, indexes) {
+  var permutes = [],
+      i = -1,
+      n = indexes.length;
+  while (++i < n) permutes[i] = array[indexes[i]];
+  return permutes;
+};
+d3.merge = function(arrays) {
+  return Array.prototype.concat.apply([], arrays);
+};
+d3.split = function(array, f) {
+  var arrays = [],
+      values = [],
+      value,
+      i = -1,
+      n = array.length;
+  if (arguments.length < 2) f = d3_splitter;
+  while (++i < n) {
+    if (f.call(values, value = array[i], i)) {
+      values = [];
+    } else {
+      if (!values.length) arrays.push(values);
+      values.push(value);
+    }
+  }
+  return arrays;
+};
+
+function d3_splitter(d) {
+  return d == null;
+}
+function d3_collapse(s) {
+  return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
+}
+d3.range = function(start, stop, step) {
+  if (arguments.length < 3) {
+    step = 1;
+    if (arguments.length < 2) {
+      stop = start;
+      start = 0;
+    }
+  }
+  if ((stop - start) / step === Infinity) throw new Error("infinite range");
+  var range = [],
+       k = d3_range_integerScale(Math.abs(step)),
+       i = -1,
+       j;
+  start *= k, stop *= k, step *= k;
+  if (step < 0) while ((j = start + step * ++i) > stop) range.push(j / k);
+  else while ((j = start + step * ++i) < stop) range.push(j / k);
+  return range;
+};
+
+function d3_range_integerScale(x) {
+  var k = 1;
+  while (x * k % 1) k *= 10;
+  return k;
+}
+d3.requote = function(s) {
+  return s.replace(d3_requote_re, "\\$&");
+};
+
+var d3_requote_re = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;
+d3.round = function(x, n) {
+  return n
+      ? Math.round(x * (n = Math.pow(10, n))) / n
+      : Math.round(x);
+};
+d3.xhr = function(url, mime, callback) {
+  var req = new XMLHttpRequest;
+  if (arguments.length < 3) callback = mime, mime = null;
+  else if (mime && req.overrideMimeType) req.overrideMimeType(mime);
+  req.open("GET", url, true);
+  if (mime) req.setRequestHeader("Accept", mime);
+  req.onreadystatechange = function() {
+    if (req.readyState === 4) callback(req.status < 300 ? req : null);
+  };
+  req.send(null);
+};
+d3.text = function(url, mime, callback) {
+  function ready(req) {
+    callback(req && req.responseText);
+  }
+  if (arguments.length < 3) {
+    callback = mime;
+    mime = null;
+  }
+  d3.xhr(url, mime, ready);
+};
+d3.json = function(url, callback) {
+  d3.text(url, "application/json", function(text) {
+    callback(text ? JSON.parse(text) : null);
+  });
+};
+d3.html = function(url, callback) {
+  d3.text(url, "text/html", function(text) {
+    if (text != null) { // Treat empty string as valid HTML.
+      var range = document.createRange();
+      range.selectNode(document.body);
+      text = range.createContextualFragment(text);
+    }
+    callback(text);
+  });
+};
+d3.xml = function(url, mime, callback) {
+  function ready(req) {
+    callback(req && req.responseXML);
+  }
+  if (arguments.length < 3) {
+    callback = mime;
+    mime = null;
+  }
+  d3.xhr(url, mime, ready);
+};
+var d3_nsPrefix = {
+  svg: "http://www.w3.org/2000/svg",
+  xhtml: "http://www.w3.org/1999/xhtml",
+  xlink: "http://www.w3.org/1999/xlink",
+  xml: "http://www.w3.org/XML/1998/namespace",
+  xmlns: "http://www.w3.org/2000/xmlns/"
+};
+
+d3.ns = {
+  prefix: d3_nsPrefix,
+  qualify: function(name) {
+    var i = name.indexOf(":"),
+        prefix = name;
+    if (i >= 0) {
+      prefix = name.substring(0, i);
+      name = name.substring(i + 1);
+    }
+    return d3_nsPrefix.hasOwnProperty(prefix)
+        ? {space: d3_nsPrefix[prefix], local: name}
+        : name;
+  }
+};
+d3.dispatch = function() {
+  var dispatch = new d3_dispatch,
+      i = -1,
+      n = arguments.length;
+  while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch);
+  return dispatch;
+};
+
+function d3_dispatch() {}
+
+d3_dispatch.prototype.on = function(type, listener) {
+  var i = type.indexOf("."),
+      name = "";
+
+  // Extract optional namespace, e.g., "click.foo"
+  if (i > 0) {
+    name = type.substring(i + 1);
+    type = type.substring(0, i);
+  }
+
+  return arguments.length < 2
+      ? this[type].on(name)
+      : this[type].on(name, listener);
+};
+
+function d3_dispatch_event(dispatch) {
+  var listeners = [],
+      listenerByName = new d3_Map;
+
+  function event() {
+    var z = listeners, // defensive reference
+        i = -1,
+        n = z.length,
+        l;
+    while (++i < n) if (l = z[i].on) l.apply(this, arguments);
+    return dispatch;
+  }
+
+  event.on = function(name, listener) {
+    var l = listenerByName.get(name),
+        i;
+
+    // return the current listener, if any
+    if (arguments.length < 2) return l && l.on;
+
+    // remove the old listener, if any (with copy-on-write)
+    if (l) {
+      l.on = null;
+      listeners = listeners.slice(0, i = listeners.indexOf(l)).concat(listeners.slice(i + 1));
+      listenerByName.remove(name);
+    }
+
+    // add the new listener, if any
+    if (listener) listeners.push(listenerByName.set(name, {on: listener}));
+
+    return dispatch;
+  };
+
+  return event;
+}
+// TODO align
+d3.format = function(specifier) {
+  var match = d3_format_re.exec(specifier),
+      fill = match[1] || " ",
+      sign = match[3] || "",
+      zfill = match[5],
+      width = +match[6],
+      comma = match[7],
+      precision = match[8],
+      type = match[9],
+      scale = 1,
+      suffix = "",
+      integer = false;
+
+  if (precision) precision = +precision.substring(1);
+
+  if (zfill) {
+    fill = "0"; // TODO align = "=";
+    if (comma) width -= Math.floor((width - 1) / 4);
+  }
+
+  switch (type) {
+    case "n": comma = true; type = "g"; break;
+    case "%": scale = 100; suffix = "%"; type = "f"; break;
+    case "p": scale = 100; suffix = "%"; type = "r"; break;
+    case "d": integer = true; precision = 0; break;
+    case "s": scale = -1; type = "r"; break;
+  }
+
+  // If no precision is specified for r, fallback to general notation.
+  if (type == "r" && !precision) type = "g";
+
+  type = d3_format_types.get(type) || d3_format_typeDefault;
+
+  return function(value) {
+
+    // Return the empty string for floats formatted as ints.
+    if (integer && (value % 1)) return "";
+
+    // Convert negative to positive, and record the sign prefix.
+    var negative = (value < 0) && (value = -value) ? "\u2212" : sign;
+
+    // Apply the scale, computing it from the value's exponent for si format.
+    if (scale < 0) {
+      var prefix = d3.formatPrefix(value, precision);
+      value *= prefix.scale;
+      suffix = prefix.symbol;
+    } else {
+      value *= scale;
+    }
+
+    // Convert to the desired precision.
+    value = type(value, precision);
+
+    // If the fill character is 0, the sign and group is applied after the fill.
+    if (zfill) {
+      var length = value.length + negative.length;
+      if (length < width) value = new Array(width - length + 1).join(fill) + value;
+      if (comma) value = d3_format_group(value);
+      value = negative + value;
+    }
+
+    // Otherwise (e.g., space-filling), the sign and group is applied before.
+    else {
+      if (comma) value = d3_format_group(value);
+      value = negative + value;
+      var length = value.length;
+      if (length < width) value = new Array(width - length + 1).join(fill) + value;
+    }
+
+    return value + suffix;
+  };
+};
+
+// [[fill]align][sign][#][0][width][,][.precision][type]
+var d3_format_re = /(?:([^{])?([<>=^]))?([+\- ])?(#)?(0)?([0-9]+)?(,)?(\.[0-9]+)?([a-zA-Z%])?/;
+
+var d3_format_types = d3.map({
+  g: function(x, p) { return x.toPrecision(p); },
+  e: function(x, p) { return x.toExponential(p); },
+  f: function(x, p) { return x.toFixed(p); },
+  r: function(x, p) { return d3.round(x, p = d3_format_precision(x, p)).toFixed(Math.max(0, Math.min(20, p))); }
+});
+
+function d3_format_precision(x, p) {
+  return p - (x ? 1 + Math.floor(Math.log(x + Math.pow(10, 1 + Math.floor(Math.log(x) / Math.LN10) - p)) / Math.LN10) : 1);
+}
+
+function d3_format_typeDefault(x) {
+  return x + "";
+}
+
+// Apply comma grouping for thousands.
+function d3_format_group(value) {
+  var i = value.lastIndexOf("."),
+      f = i >= 0 ? value.substring(i) : (i = value.length, ""),
+      t = [];
+  while (i > 0) t.push(value.substring(i -= 3, i + 3));
+  return t.reverse().join(",") + f;
+}
+var d3_formatPrefixes = ["y","z","a","f","p","n","μ","m","","k","M","G","T","P","E","Z","Y"].map(d3_formatPrefix);
+
+d3.formatPrefix = function(value, precision) {
+  var i = 0;
+  if (value) {
+    if (value < 0) value *= -1;
+    if (precision) value = d3.round(value, d3_format_precision(value, precision));
+    i = 1 + Math.floor(1e-12 + Math.log(value) / Math.LN10);
+    i = Math.max(-24, Math.min(24, Math.floor((i <= 0 ? i + 1 : i - 1) / 3) * 3));
+  }
+  return d3_formatPrefixes[8 + i / 3];
+};
+
+function d3_formatPrefix(d, i) {
+  return {
+    scale: Math.pow(10, (8 - i) * 3),
+    symbol: d
+  };
+}
+
+/*
+ * TERMS OF USE - EASING EQUATIONS
+ *
+ * Open source under the BSD License.
+ *
+ * Copyright 2001 Robert Penner
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the author nor the names of contributors may be used to
+ *   endorse or promote products derived from this software without specific
+ *   prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+var d3_ease_quad = d3_ease_poly(2),
+    d3_ease_cubic = d3_ease_poly(3),
+    d3_ease_default = function() { return d3_ease_identity; };
+
+var d3_ease = d3.map({
+  linear: d3_ease_default,
+  poly: d3_ease_poly,
+  quad: function() { return d3_ease_quad; },
+  cubic: function() { return d3_ease_cubic; },
+  sin: function() { return d3_ease_sin; },
+  exp: function() { return d3_ease_exp; },
+  circle: function() { return d3_ease_circle; },
+  elastic: d3_ease_elastic,
+  back: d3_ease_back,
+  bounce: function() { return d3_ease_bounce; }
+});
+
+var d3_ease_mode = d3.map({
+  "in": d3_ease_identity,
+  "out": d3_ease_reverse,
+  "in-out": d3_ease_reflect,
+  "out-in": function(f) { return d3_ease_reflect(d3_ease_reverse(f)); }
+});
+
+d3.ease = function(name) {
+  var i = name.indexOf("-"),
+      t = i >= 0 ? name.substring(0, i) : name,
+      m = i >= 0 ? name.substring(i + 1) : "in";
+  t = d3_ease.get(t) || d3_ease_default;
+  m = d3_ease_mode.get(m) || d3_ease_identity;
+  return d3_ease_clamp(m(t.apply(null, Array.prototype.slice.call(arguments, 1))));
+};
+
+function d3_ease_clamp(f) {
+  return function(t) {
+    return t <= 0 ? 0 : t >= 1 ? 1 : f(t);
+  };
+}
+
+function d3_ease_reverse(f) {
+  return function(t) {
+    return 1 - f(1 - t);
+  };
+}
+
+function d3_ease_reflect(f) {
+  return function(t) {
+    return .5 * (t < .5 ? f(2 * t) : (2 - f(2 - 2 * t)));
+  };
+}
+
+function d3_ease_identity(t) {
+  return t;
+}
+
+function d3_ease_poly(e) {
+  return function(t) {
+    return Math.pow(t, e);
+  };
+}
+
+function d3_ease_sin(t) {
+  return 1 - Math.cos(t * Math.PI / 2);
+}
+
+function d3_ease_exp(t) {
+  return Math.pow(2, 10 * (t - 1));
+}
+
+function d3_ease_circle(t) {
+  return 1 - Math.sqrt(1 - t * t);
+}
+
+function d3_ease_elastic(a, p) {
+  var s;
+  if (arguments.length < 2) p = 0.45;
+  if (arguments.length < 1) { a = 1; s = p / 4; }
+  else s = p / (2 * Math.PI) * Math.asin(1 / a);
+  return function(t) {
+    return 1 + a * Math.pow(2, 10 * -t) * Math.sin((t - s) * 2 * Math.PI / p);
+  };
+}
+
+function d3_ease_back(s) {
+  if (!s) s = 1.70158;
+  return function(t) {
+    return t * t * ((s + 1) * t - s);
+  };
+}
+
+function d3_ease_bounce(t) {
+  return t < 1 / 2.75 ? 7.5625 * t * t
+      : t < 2 / 2.75 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75
+      : t < 2.5 / 2.75 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375
+      : 7.5625 * (t -= 2.625 / 2.75) * t + .984375;
+}
+d3.event = null;
+
+function d3_eventCancel() {
+  d3.event.stopPropagation();
+  d3.event.preventDefault();
+}
+
+function d3_eventSource() {
+  var e = d3.event, s;
+  while (s = e.sourceEvent) e = s;
+  return e;
+}
+
+// Like d3.dispatch, but for custom events abstracting native UI events. These
+// events have a target component (such as a brush), a target element (such as
+// the svg:g element containing the brush) and the standard arguments `d` (the
+// target element's data) and `i` (the selection index of the target element).
+function d3_eventDispatch(target) {
+  var dispatch = new d3_dispatch,
+      i = 0,
+      n = arguments.length;
+
+  while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch);
+
+  // Creates a dispatch context for the specified `thiz` (typically, the target
+  // DOM element that received the source event) and `argumentz` (typically, the
+  // data `d` and index `i` of the target element). The returned function can be
+  // used to dispatch an event to any registered listeners; the function takes a
+  // single argument as input, being the event to dispatch. The event must have
+  // a "type" attribute which corresponds to a type registered in the
+  // constructor. This context will automatically populate the "sourceEvent" and
+  // "target" attributes of the event, as well as setting the `d3.event` global
+  // for the duration of the notification.
+  dispatch.of = function(thiz, argumentz) {
+    return function(e1) {
+      try {
+        var e0 =
+        e1.sourceEvent = d3.event;
+        e1.target = target;
+        d3.event = e1;
+        dispatch[e1.type].apply(thiz, argumentz);
+      } finally {
+        d3.event = e0;
+      }
+    };
+  };
+
+  return dispatch;
+}
+d3.interpolate = function(a, b) {
+  var i = d3.interpolators.length, f;
+  while (--i >= 0 && !(f = d3.interpolators[i](a, b)));
+  return f;
+};
+
+d3.interpolateNumber = function(a, b) {
+  b -= a;
+  return function(t) { return a + b * t; };
+};
+
+d3.interpolateRound = function(a, b) {
+  b -= a;
+  return function(t) { return Math.round(a + b * t); };
+};
+
+d3.interpolateString = function(a, b) {
+  var m, // current match
+      i, // current index
+      j, // current index (for coallescing)
+      s0 = 0, // start index of current string prefix
+      s1 = 0, // end index of current string prefix
+      s = [], // string constants and placeholders
+      q = [], // number interpolators
+      n, // q.length
+      o;
+
+  // Reset our regular expression!
+  d3_interpolate_number.lastIndex = 0;
+
+  // Find all numbers in b.
+  for (i = 0; m = d3_interpolate_number.exec(b); ++i) {
+    if (m.index) s.push(b.substring(s0, s1 = m.index));
+    q.push({i: s.length, x: m[0]});
+    s.push(null);
+    s0 = d3_interpolate_number.lastIndex;
+  }
+  if (s0 < b.length) s.push(b.substring(s0));
+
+  // Find all numbers in a.
+  for (i = 0, n = q.length; (m = d3_interpolate_number.exec(a)) && i < n; ++i) {
+    o = q[i];
+    if (o.x == m[0]) { // The numbers match, so coallesce.
+      if (o.i) {
+        if (s[o.i + 1] == null) { // This match is followed by another number.
+          s[o.i - 1] += o.x;
+          s.splice(o.i, 1);
+          for (j = i + 1; j < n; ++j) q[j].i--;
+        } else { // This match is followed by a string, so coallesce twice.
+          s[o.i - 1] += o.x + s[o.i + 1];
+          s.splice(o.i, 2);
+          for (j = i + 1; j < n; ++j) q[j].i -= 2;
+        }
+      } else {
+          if (s[o.i + 1] == null) { // This match is followed by another number.
+          s[o.i] = o.x;
+        } else { // This match is followed by a string, so coallesce twice.
+          s[o.i] = o.x + s[o.i + 1];
+          s.splice(o.i + 1, 1);
+          for (j = i + 1; j < n; ++j) q[j].i--;
+        }
+      }
+      q.splice(i, 1);
+      n--;
+      i--;
+    } else {
+      o.x = d3.interpolateNumber(parseFloat(m[0]), parseFloat(o.x));
+    }
+  }
+
+  // Remove any numbers in b not found in a.
+  while (i < n) {
+    o = q.pop();
+    if (s[o.i + 1] == null) { // This match is followed by another number.
+      s[o.i] = o.x;
+    } else { // This match is followed by a string, so coallesce twice.
+      s[o.i] = o.x + s[o.i + 1];
+      s.splice(o.i + 1, 1);
+    }
+    n--;
+  }
+
+  // Special optimization for only a single match.
+  if (s.length === 1) {
+    return s[0] == null ? q[0].x : function() { return b; };
+  }
+
+  // Otherwise, interpolate each of the numbers and rejoin the string.
+  return function(t) {
+    for (i = 0; i < n; ++i) s[(o = q[i]).i] = o.x(t);
+    return s.join("");
+  };
+};
+
+d3.interpolateTransform = function(a, b) {
+  var s = [], // string constants and placeholders
+      q = [], // number interpolators
+      n,
+      A = d3.transform(a),
+      B = d3.transform(b),
+      ta = A.translate,
+      tb = B.translate,
+      ra = A.rotate,
+      rb = B.rotate,
+      wa = A.skew,
+      wb = B.skew,
+      ka = A.scale,
+      kb = B.scale;
+
+  if (ta[0] != tb[0] || ta[1] != tb[1]) {
+    s.push("translate(", null, ",", null, ")");
+    q.push({i: 1, x: d3.interpolateNumber(ta[0], tb[0])}, {i: 3, x: d3.interpolateNumber(ta[1], tb[1])});
+  } else if (tb[0] || tb[1]) {
+    s.push("translate(" + tb + ")");
+  } else {
+    s.push("");
+  }
+
+  if (ra != rb) {
+    q.push({i: s.push(s.pop() + "rotate(", null, ")") - 2, x: d3.interpolateNumber(ra, rb)});
+  } else if (rb) {
+    s.push(s.pop() + "rotate(" + rb + ")");
+  }
+
+  if (wa != wb) {
+    q.push({i: s.push(s.pop() + "skewX(", null, ")") - 2, x: d3.interpolateNumber(wa, wb)});
+  } else if (wb) {
+    s.push(s.pop() + "skewX(" + wb + ")");
+  }
+
+  if (ka[0] != kb[0] || ka[1] != kb[1]) {
+    n = s.push(s.pop() + "scale(", null, ",", null, ")");
+    q.push({i: n - 4, x: d3.interpolateNumber(ka[0], kb[0])}, {i: n - 2, x: d3.interpolateNumber(ka[1], kb[1])});
+  } else if (kb[0] != 1 || kb[1] != 1) {
+    s.push(s.pop() + "scale(" + kb + ")");
+  }
+
+  n = q.length;
+  return function(t) {
+    var i = -1, o;
+    while (++i < n) s[(o = q[i]).i] = o.x(t);
+    return s.join("");
+  };
+};
+
+d3.interpolateRgb = function(a, b) {
+  a = d3.rgb(a);
+  b = d3.rgb(b);
+  var ar = a.r,
+      ag = a.g,
+      ab = a.b,
+      br = b.r - ar,
+      bg = b.g - ag,
+      bb = b.b - ab;
+  return function(t) {
+    return "#"
+        + d3_rgb_hex(Math.round(ar + br * t))
+        + d3_rgb_hex(Math.round(ag + bg * t))
+        + d3_rgb_hex(Math.round(ab + bb * t));
+  };
+};
+
+// interpolates HSL space, but outputs RGB string (for compatibility)
+d3.interpolateHsl = function(a, b) {
+  a = d3.hsl(a);
+  b = d3.hsl(b);
+  var h0 = a.h,
+      s0 = a.s,
+      l0 = a.l,
+      h1 = b.h - h0,
+      s1 = b.s - s0,
+      l1 = b.l - l0;
+  return function(t) {
+    return d3_hsl_rgb(h0 + h1 * t, s0 + s1 * t, l0 + l1 * t).toString();
+  };
+};
+
+d3.interpolateArray = function(a, b) {
+  var x = [],
+      c = [],
+      na = a.length,
+      nb = b.length,
+      n0 = Math.min(a.length, b.length),
+      i;
+  for (i = 0; i < n0; ++i) x.push(d3.interpolate(a[i], b[i]));
+  for (; i < na; ++i) c[i] = a[i];
+  for (; i < nb; ++i) c[i] = b[i];
+  return function(t) {
+    for (i = 0; i < n0; ++i) c[i] = x[i](t);
+    return c;
+  };
+};
+
+d3.interpolateObject = function(a, b) {
+  var i = {},
+      c = {},
+      k;
+  for (k in a) {
+    if (k in b) {
+      i[k] = d3_interpolateByName(k)(a[k], b[k]);
+    } else {
+      c[k] = a[k];
+    }
+  }
+  for (k in b) {
+    if (!(k in a)) {
+      c[k] = b[k];
+    }
+  }
+  return function(t) {
+    for (k in i) c[k] = i[k](t);
+    return c;
+  };
+}
+
+var d3_interpolate_number = /[-+]?(?:\d*\.?\d+)(?:[eE][-+]?\d+)?/g;
+
+function d3_interpolateByName(n) {
+  return n == "transform"
+      ? d3.interpolateTransform
+      : d3.interpolate;
+}
+
+d3.interpolators = [
+  d3.interpolateObject,
+  function(a, b) { return (b instanceof Array) && d3.interpolateArray(a, b); },
+  function(a, b) { return (typeof a === "string" || typeof b === "string") && d3.interpolateString(a + "", b + ""); },
+  function(a, b) { return (typeof b === "string" ? d3_rgb_names.has(b) || /^(#|rgb\(|hsl\()/.test(b) : b instanceof d3_Rgb || b instanceof d3_Hsl) && d3.interpolateRgb(a, b); },
+  function(a, b) { return !isNaN(a = +a) && !isNaN(b = +b) && d3.interpolateNumber(a, b); }
+];
+function d3_uninterpolateNumber(a, b) {
+  b = b - (a = +a) ? 1 / (b - a) : 0;
+  return function(x) { return (x - a) * b; };
+}
+
+function d3_uninterpolateClamp(a, b) {
+  b = b - (a = +a) ? 1 / (b - a) : 0;
+  return function(x) { return Math.max(0, Math.min(1, (x - a) * b)); };
+}
+d3.rgb = function(r, g, b) {
+  return arguments.length === 1
+      ? (r instanceof d3_Rgb ? d3_rgb(r.r, r.g, r.b)
+      : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb))
+      : d3_rgb(~~r, ~~g, ~~b);
+};
+
+function d3_rgb(r, g, b) {
+  return new d3_Rgb(r, g, b);
+}
+
+function d3_Rgb(r, g, b) {
+  this.r = r;
+  this.g = g;
+  this.b = b;
+}
+
+d3_Rgb.prototype.brighter = function(k) {
+  k = Math.pow(0.7, arguments.length ? k : 1);
+  var r = this.r,
+      g = this.g,
+      b = this.b,
+      i = 30;
+  if (!r && !g && !b) return d3_rgb(i, i, i);
+  if (r && r < i) r = i;
+  if (g && g < i) g = i;
+  if (b && b < i) b = i;
+  return d3_rgb(
+      Math.min(255, Math.floor(r / k)),
+      Math.min(255, Math.floor(g / k)),
+      Math.min(255, Math.floor(b / k)));
+};
+
+d3_Rgb.prototype.darker = function(k) {
+  k = Math.pow(0.7, arguments.length ? k : 1);
+  return d3_rgb(
+      Math.floor(k * this.r),
+      Math.floor(k * this.g),
+      Math.floor(k * this.b));
+};
+
+d3_Rgb.prototype.hsl = function() {
+  return d3_rgb_hsl(this.r, this.g, this.b);
+};
+
+d3_Rgb.prototype.toString = function() {
+  return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b);
+};
+
+function d3_rgb_hex(v) {
+  return v < 0x10
+      ? "0" + Math.max(0, v).toString(16)
+      : Math.min(255, v).toString(16);
+}
+
+function d3_rgb_parse(format, rgb, hsl) {
+  var r = 0, // red channel; int in [0, 255]
+      g = 0, // green channel; int in [0, 255]
+      b = 0, // blue channel; int in [0, 255]
+      m1, // CSS color specification match
+      m2, // CSS color specification type (e.g., rgb)
+      name;
+
+  /* Handle hsl, rgb. */
+  m1 = /([a-z]+)\((.*)\)/i.exec(format);
+  if (m1) {
+    m2 = m1[2].split(",");
+    switch (m1[1]) {
+      case "hsl": {
+        return hsl(
+          parseFloat(m2[0]), // degrees
+          parseFloat(m2[1]) / 100, // percentage
+          parseFloat(m2[2]) / 100 // percentage
+        );
+      }
+      case "rgb": {
+        return rgb(
+          d3_rgb_parseNumber(m2[0]),
+          d3_rgb_parseNumber(m2[1]),
+          d3_rgb_parseNumber(m2[2])
+        );
+      }
+    }
+  }
+
+  /* Named colors. */
+  if (name = d3_rgb_names.get(format)) return rgb(name.r, name.g, name.b);
+
+  /* Hexadecimal colors: #rgb and #rrggbb. */
+  if (format != null && format.charAt(0) === "#") {
+    if (format.length === 4) {
+      r = format.charAt(1); r += r;
+      g = format.charAt(2); g += g;
+      b = format.charAt(3); b += b;
+    } else if (format.length === 7) {
+      r = format.substring(1, 3);
+      g = format.substring(3, 5);
+      b = format.substring(5, 7);
+    }
+    r = parseInt(r, 16);
+    g = parseInt(g, 16);
+    b = parseInt(b, 16);
+  }
+
+  return rgb(r, g, b);
+}
+
+function d3_rgb_hsl(r, g, b) {
+  var min = Math.min(r /= 255, g /= 255, b /= 255),
+      max = Math.max(r, g, b),
+      d = max - min,
+      h,
+      s,
+      l = (max + min) / 2;
+  if (d) {
+    s = l < .5 ? d / (max + min) : d / (2 - max - min);
+    if (r == max) h = (g - b) / d + (g < b ? 6 : 0);
+    else if (g == max) h = (b - r) / d + 2;
+    else h = (r - g) / d + 4;
+    h *= 60;
+  } else {
+    s = h = 0;
+  }
+  return d3_hsl(h, s, l);
+}
+
+function d3_rgb_parseNumber(c) { // either integer or percentage
+  var f = parseFloat(c);
+  return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f;
+}
+
+var d3_rgb_names = d3.map({
+  aliceblue: "#f0f8ff",
+  antiquewhite: "#faebd7",
+  aqua: "#00ffff",
+  aquamarine: "#7fffd4",
+  azure: "#f0ffff",
+  beige: "#f5f5dc",
+  bisque: "#ffe4c4",
+  black: "#000000",
+  blanchedalmond: "#ffebcd",
+  blue: "#0000ff",
+  blueviolet: "#8a2be2",
+  brown: "#a52a2a",
+  burlywood: "#deb887",
+  cadetblue: "#5f9ea0",
+  chartreuse: "#7fff00",
+  chocolate: "#d2691e",
+  coral: "#ff7f50",
+  cornflowerblue: "#6495ed",
+  cornsilk: "#fff8dc",
+  crimson: "#dc143c",
+  cyan: "#00ffff",
+  darkblue: "#00008b",
+  darkcyan: "#008b8b",
+  darkgoldenrod: "#b8860b",
+  darkgray: "#a9a9a9",
+  darkgreen: "#006400",
+  darkgrey: "#a9a9a9",
+  darkkhaki: "#bdb76b",
+  darkmagenta: "#8b008b",
+  darkolivegreen: "#556b2f",
+  darkorange: "#ff8c00",
+  darkorchid: "#9932cc",
+  darkred: "#8b0000",
+  darksalmon: "#e9967a",
+  darkseagreen: "#8fbc8f",
+  darkslateblue: "#483d8b",
+  darkslategray: "#2f4f4f",
+  darkslategrey: "#2f4f4f",
+  darkturquoise: "#00ced1",
+  darkviolet: "#9400d3",
+  deeppink: "#ff1493",
+  deepskyblue: "#00bfff",
+  dimgray: "#696969",
+  dimgrey: "#696969",
+  dodgerblue: "#1e90ff",
+  firebrick: "#b22222",
+  floralwhite: "#fffaf0",
+  forestgreen: "#228b22",
+  fuchsia: "#ff00ff",
+  gainsboro: "#dcdcdc",
+  ghostwhite: "#f8f8ff",
+  gold: "#ffd700",
+  goldenrod: "#daa520",
+  gray: "#808080",
+  green: "#008000",
+  greenyellow: "#adff2f",
+  grey: "#808080",
+  honeydew: "#f0fff0",
+  hotpink: "#ff69b4",
+  indianred: "#cd5c5c",
+  indigo: "#4b0082",
+  ivory: "#fffff0",
+  khaki: "#f0e68c",
+  lavender: "#e6e6fa",
+  lavenderblush: "#fff0f5",
+  lawngreen: "#7cfc00",
+  lemonchiffon: "#fffacd",
+  lightblue: "#add8e6",
+  lightcoral: "#f08080",
+  lightcyan: "#e0ffff",
+  lightgoldenrodyellow: "#fafad2",
+  lightgray: "#d3d3d3",
+  lightgreen: "#90ee90",
+  lightgrey: "#d3d3d3",
+  lightpink: "#ffb6c1",
+  lightsalmon: "#ffa07a",
+  lightseagreen: "#20b2aa",
+  lightskyblue: "#87cefa",
+  lightslategray: "#778899",
+  lightslategrey: "#778899",
+  lightsteelblue: "#b0c4de",
+  lightyellow: "#ffffe0",
+  lime: "#00ff00",
+  limegreen: "#32cd32",
+  linen: "#faf0e6",
+  magenta: "#ff00ff",
+  maroon: "#800000",
+  mediumaquamarine: "#66cdaa",
+  mediumblue: "#0000cd",
+  mediumorchid: "#ba55d3",
+  mediumpurple: "#9370db",
+  mediumseagreen: "#3cb371",
+  mediumslateblue: "#7b68ee",
+  mediumspringgreen: "#00fa9a",
+  mediumturquoise: "#48d1cc",
+  mediumvioletred: "#c71585",
+  midnightblue: "#191970",
+  mintcream: "#f5fffa",
+  mistyrose: "#ffe4e1",
+  moccasin: "#ffe4b5",
+  navajowhite: "#ffdead",
+  navy: "#000080",
+  oldlace: "#fdf5e6",
+  olive: "#808000",
+  olivedrab: "#6b8e23",
+  orange: "#ffa500",
+  orangered: "#ff4500",
+  orchid: "#da70d6",
+  palegoldenrod: "#eee8aa",
+  palegreen: "#98fb98",
+  paleturquoise: "#afeeee",
+  palevioletred: "#db7093",
+  papayawhip: "#ffefd5",
+  peachpuff: "#ffdab9",
+  peru: "#cd853f",
+  pink: "#ffc0cb",
+  plum: "#dda0dd",
+  powderblue: "#b0e0e6",
+  purple: "#800080",
+  red: "#ff0000",
+  rosybrown: "#bc8f8f",
+  royalblue: "#4169e1",
+  saddlebrown: "#8b4513",
+  salmon: "#fa8072",
+  sandybrown: "#f4a460",
+  seagreen: "#2e8b57",
+  seashell: "#fff5ee",
+  sienna: "#a0522d",
+  silver: "#c0c0c0",
+  skyblue: "#87ceeb",
+  slateblue: "#6a5acd",
+  slategray: "#708090",
+  slategrey: "#708090",
+  snow: "#fffafa",
+  springgreen: "#00ff7f",
+  steelblue: "#4682b4",
+  tan: "#d2b48c",
+  teal: "#008080",
+  thistle: "#d8bfd8",
+  tomato: "#ff6347",
+  turquoise: "#40e0d0",
+  violet: "#ee82ee",
+  wheat: "#f5deb3",
+  white: "#ffffff",
+  whitesmoke: "#f5f5f5",
+  yellow: "#ffff00",
+  yellowgreen: "#9acd32"
+});
+
+d3_rgb_names.forEach(function(key, value) {
+  d3_rgb_names.set(key, d3_rgb_parse(value, d3_rgb, d3_hsl_rgb));
+});
+d3.hsl = function(h, s, l) {
+  return arguments.length === 1
+      ? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l)
+      : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl))
+      : d3_hsl(+h, +s, +l);
+};
+
+function d3_hsl(h, s, l) {
+  return new d3_Hsl(h, s, l);
+}
+
+function d3_Hsl(h, s, l) {
+  this.h = h;
+  this.s = s;
+  this.l = l;
+}
+
+d3_Hsl.prototype.brighter = function(k) {
+  k = Math.pow(0.7, arguments.length ? k : 1);
+  return d3_hsl(this.h, this.s, this.l / k);
+};
+
+d3_Hsl.prototype.darker = function(k) {
+  k = Math.pow(0.7, arguments.length ? k : 1);
+  return d3_hsl(this.h, this.s, k * this.l);
+};
+
+d3_Hsl.prototype.rgb = function() {
+  return d3_hsl_rgb(this.h, this.s, this.l);
+};
+
+d3_Hsl.prototype.toString = function() {
+  return this.rgb().toString();
+};
+
+function d3_hsl_rgb(h, s, l) {
+  var m1,
+      m2;
+
+  /* Some simple corrections for h, s and l. */
+  h = h % 360; if (h < 0) h += 360;
+  s = s < 0 ? 0 : s > 1 ? 1 : s;
+  l = l < 0 ? 0 : l > 1 ? 1 : l;
+
+  /* From FvD 13.37, CSS Color Module Level 3 */
+  m2 = l <= .5 ? l * (1 + s) : l + s - l * s;
+  m1 = 2 * l - m2;
+
+  function v(h) {
+    if (h > 360) h -= 360;
+    else if (h < 0) h += 360;
+    if (h < 60) return m1 + (m2 - m1) * h / 60;
+    if (h < 180) return m2;
+    if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;
+    return m1;
+  }
+
+  function vv(h) {
+    return Math.round(v(h) * 255);
+  }
+
+  return d3_rgb(vv(h + 120), vv(h), vv(h - 120));
+}
+function d3_selection(groups) {
+  d3_arraySubclass(groups, d3_selectionPrototype);
+  return groups;
+}
+
+var d3_select = function(s, n) { return n.querySelector(s); },
+    d3_selectAll = function(s, n) { return n.querySelectorAll(s); },
+    d3_selectRoot = document.documentElement,
+    d3_selectMatcher = d3_selectRoot.matchesSelector || d3_selectRoot.webkitMatchesSelector || d3_selectRoot.mozMatchesSelector || d3_selectRoot.msMatchesSelector || d3_selectRoot.oMatchesSelector,
+    d3_selectMatches = function(n, s) { return d3_selectMatcher.call(n, s); };
+
+// Prefer Sizzle, if available.
+if (typeof Sizzle === "function") {
+  d3_select = function(s, n) { return Sizzle(s, n)[0]; };
+  d3_selectAll = function(s, n) { return Sizzle.uniqueSort(Sizzle(s, n)); };
+  d3_selectMatches = Sizzle.matchesSelector;
+}
+
+var d3_selectionPrototype = [];
+
+d3.selection = function() {
+  return d3_selectionRoot;
+};
+
+d3.selection.prototype = d3_selectionPrototype;
+d3_selectionPrototype.select = function(selector) {
+  var subgroups = [],
+      subgroup,
+      subnode,
+      group,
+      node;
+
+  if (typeof selector !== "function") selector = d3_selection_selector(selector);
+
+  for (var j = -1, m = this.length; ++j < m;) {
+    subgroups.push(subgroup = []);
+    subgroup.parentNode = (group = this[j]).parentNode;
+    for (var i = -1, n = group.length; ++i < n;) {
+      if (node = group[i]) {
+        subgroup.push(subnode = selector.call(node, node.__data__, i));
+        if (subnode && "__data__" in node) subnode.__data__ = node.__data__;
+      } else {
+        subgroup.push(null);
+      }
+    }
+  }
+
+  return d3_selection(subgroups);
+};
+
+function d3_selection_selector(selector) {
+  return function() {
+    return d3_select(selector, this);
+  };
+}
+d3_selectionPrototype.selectAll = function(selector) {
+  var subgroups = [],
+      subgroup,
+      node;
+
+  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
+
+  for (var j = -1, m = this.length; ++j < m;) {
+    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
+      if (node = group[i]) {
+        subgroups.push(subgroup = d3_array(selector.call(node, node.__data__, i)));
+        subgroup.parentNode = node;
+      }
+    }
+  }
+
+  return d3_selection(subgroups);
+};
+
+function d3_selection_selectorAll(selector) {
+  return function() {
+    return d3_selectAll(selector, this);
+  };
+}
+d3_selectionPrototype.attr = function(name, value) {
+  name = d3.ns.qualify(name);
+
+  // If no value is specified, return the first value.
+  if (arguments.length < 2) {
+    var node = this.node();
+    return name.local
+        ? node.getAttributeNS(name.space, name.local)
+        : node.getAttribute(name);
+  }
+
+  function attrNull() {
+    this.removeAttribute(name);
+  }
+
+  function attrNullNS() {
+    this.removeAttributeNS(name.space, name.local);
+  }
+
+  function attrConstant() {
+    this.setAttribute(name, value);
+  }
+
+  function attrConstantNS() {
+    this.setAttributeNS(name.space, name.local, value);
+  }
+
+  function attrFunction() {
+    var x = value.apply(this, arguments);
+    if (x == null) this.removeAttribute(name);
+    else this.setAttribute(name, x);
+  }
+
+  function attrFunctionNS() {
+    var x = value.apply(this, arguments);
+    if (x == null) this.removeAttributeNS(name.space, name.local);
+    else this.setAttributeNS(name.space, name.local, x);
+  }
+
+  return this.each(value == null
+      ? (name.local ? attrNullNS : attrNull) : (typeof value === "function"
+      ? (name.local ? attrFunctionNS : attrFunction)
+      : (name.local ? attrConstantNS : attrConstant)));
+};
+d3_selectionPrototype.classed = function(name, value) {
+  var names = name.split(d3_selection_classedWhitespace),
+      n = names.length,
+      i = -1;
+  if (arguments.length > 1) {
+    while (++i < n) d3_selection_classed.call(this, names[i], value);
+    return this;
+  } else {
+    while (++i < n) if (!d3_selection_classed.call(this, names[i])) return false;
+    return true;
+  }
+};
+
+var d3_selection_classedWhitespace = /\s+/g;
+
+function d3_selection_classed(name, value) {
+  var re = new RegExp("(^|\\s+)" + d3.requote(name) + "(\\s+|$)", "g");
+
+  // If no value is specified, return the first value.
+  if (arguments.length < 2) {
+    var node = this.node();
+    if (c = node.classList) return c.contains(name);
+    var c = node.className;
+    re.lastIndex = 0;
+    return re.test(c.baseVal != null ? c.baseVal : c);
+  }
+
+  function classedAdd() {
+    if (c = this.classList) return c.add(name);
+    var c = this.className,
+        cb = c.baseVal != null,
+        cv = cb ? c.baseVal : c;
+    re.lastIndex = 0;
+    if (!re.test(cv)) {
+      cv = d3_collapse(cv + " " + name);
+      if (cb) c.baseVal = cv;
+      else this.className = cv;
+    }
+  }
+
+  function classedRemove() {
+    if (c = this.classList) return c.remove(name);
+    var c = this.className,
+        cb = c.baseVal != null,
+        cv = cb ? c.baseVal : c;
+    cv = d3_collapse(cv.replace(re, " "));
+    if (cb) c.baseVal = cv;
+    else this.className = cv;
+  }
+
+  function classedFunction() {
+    (value.apply(this, arguments)
+        ? classedAdd
+        : classedRemove).call(this);
+  }
+
+  return this.each(typeof value === "function"
+      ? classedFunction : value
+      ? classedAdd
+      : classedRemove);
+}
+d3_selectionPrototype.style = function(name, value, priority) {
+  if (arguments.length < 3) priority = "";
+
+  // If no value is specified, return the first value.
+  if (arguments.length < 2) return window
+      .getComputedStyle(this.node(), null)
+      .getPropertyValue(name);
+
+  function styleNull() {
+    this.style.removeProperty(name);
+  }
+
+  function styleConstant() {
+    this.style.setProperty(name, value, priority);
+  }
+
+  function styleFunction() {
+    var x = value.apply(this, arguments);
+    if (x == null) this.style.removeProperty(name);
+    else this.style.setProperty(name, x, priority);
+  }
+
+  return this.each(value == null
+      ? styleNull : (typeof value === "function"
+      ? styleFunction : styleConstant));
+};
+d3_selectionPrototype.property = function(name, value) {
+
+  // If no value is specified, return the first value.
+  if (arguments.length < 2) return this.node()[name];
+
+  function propertyNull() {
+    delete this[name];
+  }
+
+  function propertyConstant() {
+    this[name] = value;
+  }
+
+  function propertyFunction() {
+    var x = value.apply(this, arguments);
+    if (x == null) delete this[name];
+    else this[name] = x;
+  }
+
+  return this.each(value == null
+      ? propertyNull : (typeof value === "function"
+      ? propertyFunction : propertyConstant));
+};
+d3_selectionPrototype.text = function(value) {
+  return arguments.length < 1
+      ? this.node().textContent : this.each(typeof value === "function"
+      ? function() { var v = value.apply(this, arguments); this.textContent = v == null ? "" : v; } : value == null
+      ? function() { this.textContent = ""; }
+      : function() { this.textContent = value; });
+};
+d3_selectionPrototype.html = function(value) {
+  return arguments.length < 1
+      ? this.node().innerHTML : this.each(typeof value === "function"
+      ? function() { var v = value.apply(this, arguments); this.innerHTML = v == null ? "" : v; } : value == null
+      ? function() { this.innerHTML = ""; }
+      : function() { this.innerHTML = value; });
+};
+// TODO append(node)?
+// TODO append(function)?
+d3_selectionPrototype.append = function(name) {
+  name = d3.ns.qualify(name);
+
+  function append() {
+    return this.appendChild(document.createElementNS(this.namespaceURI, name));
+  }
+
+  function appendNS() {
+    return this.appendChild(document.createElementNS(name.space, name.local));
+  }
+
+  return this.select(name.local ? appendNS : append);
+};
+// TODO insert(node, function)?
+// TODO insert(function, string)?
+// TODO insert(function, function)?
+d3_selectionPrototype.insert = function(name, before) {
+  name = d3.ns.qualify(name);
+
+  function insert() {
+    return this.insertBefore(
+        document.createElementNS(this.namespaceURI, name),
+        d3_select(before, this));
+  }
+
+  function insertNS() {
+    return this.insertBefore(
+        document.createElementNS(name.space, name.local),
+        d3_select(before, this));
+  }
+
+  return this.select(name.local ? insertNS : insert);
+};
+// TODO remove(selector)?
+// TODO remove(node)?
+// TODO remove(function)?
+d3_selectionPrototype.remove = function() {
+  return this.each(function() {
+    var parent = this.parentNode;
+    if (parent) parent.removeChild(this);
+  });
+};
+d3_selectionPrototype.data = function(value, key) {
+  var i = -1,
+      n = this.length,
+      group,
+      node;
+
+  // If no value is specified, return the first value.
+  if (!arguments.length) {
+    value = new Array(n = (group = this[0]).length);
+    while (++i < n) {
+      if (node = group[i]) {
+        value[i] = node.__data__;
+      }
+    }
+    return value;
+  }
+
+  function bind(group, groupData) {
+    var i,
+        n = group.length,
+        m = groupData.length,
+        n0 = Math.min(n, m),
+        n1 = Math.max(n, m),
+        updateNodes = [],
+        enterNodes = [],
+        exitNodes = [],
+        node,
+        nodeData;
+
+    if (key) {
+      var nodeByKeyValue = new d3_Map,
+          keyValues = [],
+          keyValue,
+          j = groupData.length;
+
+      for (i = -1; ++i < n;) {
+        keyValue = key.call(node = group[i], node.__data__, i);
+        if (nodeByKeyValue.has(keyValue)) {
+          exitNodes[j++] = node; // duplicate key
+        } else {
+          nodeByKeyValue.set(keyValue, node);
+        }
+        keyValues.push(keyValue);
+      }
+
+      for (i = -1; ++i < m;) {
+        keyValue = key.call(groupData, nodeData = groupData[i], i)
+        if (nodeByKeyValue.has(keyValue)) {
+          updateNodes[i] = node = nodeByKeyValue.get(keyValue);
+          node.__data__ = nodeData;
+          enterNodes[i] = exitNodes[i] = null;
+        } else {
+          enterNodes[i] = d3_selection_dataNode(nodeData);
+          updateNodes[i] = exitNodes[i] = null;
+        }
+        nodeByKeyValue.remove(keyValue);
+      }
+
+      for (i = -1; ++i < n;) {
+        if (nodeByKeyValue.has(keyValues[i])) {
+          exitNodes[i] = group[i];
+        }
+      }
+    } else {
+      for (i = -1; ++i < n0;) {
+        node = group[i];
+        nodeData = groupData[i];
+        if (node) {
+          node.__data__ = nodeData;
+          updateNodes[i] = node;
+          enterNodes[i] = exitNodes[i] = null;
+        } else {
+          enterNodes[i] = d3_selection_dataNode(nodeData);
+          updateNodes[i] = exitNodes[i] = null;
+        }
+      }
+      for (; i < m; ++i) {
+        enterNodes[i] = d3_selection_dataNode(groupData[i]);
+        updateNodes[i] = exitNodes[i] = null;
+      }
+      for (; i < n1; ++i) {
+        exitNodes[i] = group[i];
+        enterNodes[i] = updateNodes[i] = null;
+      }
+    }
+
+    enterNodes.update
+        = updateNodes;
+
+    enterNodes.parentNode
+        = updateNodes.parentNode
+        = exitNodes.parentNode
+        = group.parentNode;
+
+    enter.push(enterNodes);
+    update.push(updateNodes);
+    exit.push(exitNodes);
+  }
+
+  var enter = d3_selection_enter([]),
+      update = d3_selection([]),
+      exit = d3_selection([]);
+
+  if (typeof value === "function") {
+    while (++i < n) {
+      bind(group = this[i], value.call(group, group.parentNode.__data__, i));
+    }
+  } else {
+    while (++i < n) {
+      bind(group = this[i], value);
+    }
+  }
+
+  update.enter = function() { return enter; };
+  update.exit = function() { return exit; };
+  return update;
+};
+
+function d3_selection_dataNode(data) {
+  return {__data__: data};
+}
+d3_selectionPrototype.datum =
+d3_selectionPrototype.map = function(value) {
+  return arguments.length < 1
+      ? this.property("__data__")
+      : this.property("__data__", value);
+};
+d3_selectionPrototype.filter = function(filter) {
+  var subgroups = [],
+      subgroup,
+      group,
+      node;
+
+  if (typeof filter !== "function") filter = d3_selection_filter(filter);
+
+  for (var j = 0, m = this.length; j < m; j++) {
+    subgroups.push(subgroup = []);
+    subgroup.parentNode = (group = this[j]).parentNode;
+    for (var i = 0, n = group.length; i < n; i++) {
+      if ((node = group[i]) && filter.call(node, node.__data__, i)) {
+        subgroup.push(node);
+      }
+    }
+  }
+
+  return d3_selection(subgroups);
+};
+
+function d3_selection_filter(selector) {
+  return function() {
+    return d3_selectMatches(this, selector);
+  };
+}
+d3_selectionPrototype.order = function() {
+  for (var j = -1, m = this.length; ++j < m;) {
+    for (var group = this[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
+      if (node = group[i]) {
+        if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
+        next = node;
+      }
+    }
+  }
+  return this;
+};
+d3_selectionPrototype.sort = function(comparator) {
+  comparator = d3_selection_sortComparator.apply(this, arguments);
+  for (var j = -1, m = this.length; ++j < m;) this[j].sort(comparator);
+  return this.order();
+};
+
+function d3_selection_sortComparator(comparator) {
+  if (!arguments.length) comparator = d3.ascending;
+  return function(a, b) {
+    return comparator(a && a.__data__, b && b.__data__);
+  };
+}
+// type can be namespaced, e.g., "click.foo"
+// listener can be null for removal
+d3_selectionPrototype.on = function(type, listener, capture) {
+  if (arguments.length < 3) capture = false;
+
+  // parse the type specifier
+  var name = "__on" + type, i = type.indexOf(".");
+  if (i > 0) type = type.substring(0, i);
+
+  // if called with only one argument, return the current listener
+  if (arguments.length < 2) return (i = this.node()[name]) && i._;
+
+  // remove the old event listener, and add the new event listener
+  return this.each(function(d, i) {
+    var node = this,
+        o = node[name];
+
+    // remove the old listener, if any (using the previously-set capture)
+    if (o) {
+      node.removeEventListener(type, o, o.$);
+      delete node[name];
+    }
+
+    // add the new listener, if any (remembering the capture flag)
+    if (listener) {
+      node.addEventListener(type, node[name] = l, l.$ = capture);
+      l._ = listener; // stash the unwrapped listener for get
+    }
+
+    // wrapped event listener that preserves i
+    function l(e) {
+      var o = d3.event; // Events can be reentrant (e.g., focus).
+      d3.event = e;
+      try {
+        listener.call(node, node.__data__, i);
+      } finally {
+        d3.event = o;
+      }
+    }
+  });
+};
+d3_selectionPrototype.each = function(callback) {
+  for (var j = -1, m = this.length; ++j < m;) {
+    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
+      var node = group[i];
+      if (node) callback.call(node, node.__data__, i, j);
+    }
+  }
+  return this;
+};
+//
+// Note: assigning to the arguments array simultaneously changes the value of
+// the corresponding argument!
+//
+// TODO The `this` argument probably shouldn't be the first argument to the
+// callback, anyway, since it's redundant. However, that will require a major
+// version bump due to backwards compatibility, so I'm not changing it right
+// away.
+//
+d3_selectionPrototype.call = function(callback) {
+  callback.apply(this, (arguments[0] = this, arguments));
+  return this;
+};
+d3_selectionPrototype.empty = function() {
+  return !this.node();
+};
+d3_selectionPrototype.node = function(callback) {
+  for (var j = 0, m = this.length; j < m; j++) {
+    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
+      var node = group[i];
+      if (node) return node;
+    }
+  }
+  return null;
+};
+d3_selectionPrototype.transition = function() {
+  var subgroups = [],
+      subgroup,
+      node;
+
+  for (var j = -1, m = this.length; ++j < m;) {
+    subgroups.push(subgroup = []);
+    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
+      subgroup.push((node = group[i]) ? {node: node, delay: d3_transitionDelay, duration: d3_transitionDuration} : null);
+    }
+  }
+
+  return d3_transition(subgroups, d3_transitionId || ++d3_transitionNextId, Date.now());
+};
+var d3_selectionRoot = d3_selection([[document]]);
+
+d3_selectionRoot[0].parentNode = d3_selectRoot;
+
+// TODO fast singleton implementation!
+// TODO select(function)
+d3.select = function(selector) {
+  return typeof selector === "string"
+      ? d3_selectionRoot.select(selector)
+      : d3_selection([[selector]]); // assume node
+};
+
+// TODO selectAll(function)
+d3.selectAll = function(selector) {
+  return typeof selector === "string"
+      ? d3_selectionRoot.selectAll(selector)
+      : d3_selection([d3_array(selector)]); // assume node[]
+};
+function d3_selection_enter(selection) {
+  d3_arraySubclass(selection, d3_selection_enterPrototype);
+  return selection;
+}
+
+var d3_selection_enterPrototype = [];
+
+d3.selection.enter = d3_selection_enter;
+d3.selection.enter.prototype = d3_selection_enterPrototype;
+
+d3_selection_enterPrototype.append = d3_selectionPrototype.append;
+d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;
+d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
+d3_selection_enterPrototype.node = d3_selectionPrototype.node;
+d3_selection_enterPrototype.select = function(selector) {
+  var subgroups = [],
+      subgroup,
+      subnode,
+      upgroup,
+      group,
+      node;
+
+  for (var j = -1, m = this.length; ++j < m;) {
+    upgroup = (group = this[j]).update;
+    subgroups.push(subgroup = []);
+    subgroup.parentNode = group.parentNode;
+    for (var i = -1, n = group.length; ++i < n;) {
+      if (node = group[i]) {
+        subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i));
+        subnode.__data__ = node.__data__;
+      } else {
+        subgroup.push(null);
+      }
+    }
+  }
+
+  return d3_selection(subgroups);
+};
+function d3_transition(groups, id, time) {
+  d3_arraySubclass(groups, d3_transitionPrototype);
+
+  var tweens = new d3_Map,
+      event = d3.dispatch("start", "end"),
+      ease = d3_transitionEase;
+
+  groups.id = id;
+
+  groups.time = time;
+
+  groups.tween = function(name, tween) {
+    if (arguments.length < 2) return tweens.get(name);
+    if (tween == null) tweens.remove(name);
+    else tweens.set(name, tween);
+    return groups;
+  };
+
+  groups.ease = function(value) {
+    if (!arguments.length) return ease;
+    ease = typeof value === "function" ? value : d3.ease.apply(d3, arguments);
+    return groups;
+  };
+
+  groups.each = function(type, listener) {
+    if (arguments.length < 2) return d3_transition_each.call(groups, type);
+    event.on(type, listener);
+    return groups;
+  };
+
+  d3.timer(function(elapsed) {
+    groups.each(function(d, i, j) {
+      var tweened = [],
+          node = this,
+          delay = groups[j][i].delay,
+          duration = groups[j][i].duration,
+          lock = node.__transition__ || (node.__transition__ = {active: 0, count: 0});
+
+      ++lock.count;
+
+      delay <= elapsed ? start(elapsed) : d3.timer(start, delay, time);
+
+      function start(elapsed) {
+        if (lock.active > id) return stop();
+        lock.active = id;
+
+        tweens.forEach(function(key, value) {
+          if (tween = value.call(node, d, i)) {
+            tweened.push(tween);
+          }
+        });
+
+        event.start.call(node, d, i);
+        if (!tick(elapsed)) d3.timer(tick, 0, time);
+        return 1;
+      }
+
+      function tick(elapsed) {
+        if (lock.active !== id) return stop();
+
+        var t = (elapsed - delay) / duration,
+            e = ease(t),
+            n = tweened.length;
+
+        while (n > 0) {
+          tweened[--n].call(node, e);
+        }
+
+        if (t >= 1) {
+          stop();
+          d3_transitionId = id;
+          event.end.call(node, d, i);
+          d3_transitionId = 0;
+          return 1;
+        }
+      }
+
+      function stop() {
+        if (!--lock.count) delete node.__transition__;
+        return 1;
+      }
+    });
+    return 1;
+  }, 0, time);
+
+  return groups;
+}
+
+var d3_transitionRemove = {};
+
+function d3_transitionNull(d, i, a) {
+  return a != "" && d3_transitionRemove;
+}
+
+function d3_transitionTween(name, b) {
+  var interpolate = d3_interpolateByName(name);
+
+  function transitionFunction(d, i, a) {
+    var v = b.call(this, d, i);
+    return v == null
+        ? a != "" && d3_transitionRemove
+        : a != v && interpolate(a, v);
+  }
+
+  function transitionString(d, i, a) {
+    return a != b && interpolate(a, b);
+  }
+
+  return typeof b === "function" ? transitionFunction
+      : b == null ? d3_transitionNull
+      : (b += "", transitionString);
+}
+
+var d3_transitionPrototype = [],
+    d3_transitionNextId = 0,
+    d3_transitionId = 0,
+    d3_transitionDefaultDelay = 0,
+    d3_transitionDefaultDuration = 250,
+    d3_transitionDefaultEase = d3.ease("cubic-in-out"),
+    d3_transitionDelay = d3_transitionDefaultDelay,
+    d3_transitionDuration = d3_transitionDefaultDuration,
+    d3_transitionEase = d3_transitionDefaultEase;
+
+d3_transitionPrototype.call = d3_selectionPrototype.call;
+
+d3.transition = function(selection) {
+  return arguments.length
+      ? (d3_transitionId ? selection.transition() : selection)
+      : d3_selectionRoot.transition();
+};
+
+d3.transition.prototype = d3_transitionPrototype;
+d3_transitionPrototype.select = function(selector) {
+  var subgroups = [],
+      subgroup,
+      subnode,
+      node;
+
+  if (typeof selector !== "function") selector = d3_selection_selector(selector);
+
+  for (var j = -1, m = this.length; ++j < m;) {
+    subgroups.push(subgroup = []);
+    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
+      if ((node = group[i]) && (subnode = selector.call(node.node, node.node.__data__, i))) {
+        if ("__data__" in node.node) subnode.__data__ = node.node.__data__;
+        subgroup.push({node: subnode, delay: node.delay, duration: node.duration});
+      } else {
+        subgroup.push(null);
+      }
+    }
+  }
+
+  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
+};
+d3_transitionPrototype.selectAll = function(selector) {
+  var subgroups = [],
+      subgroup,
+      subnodes,
+      node;
+
+  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
+
+  for (var j = -1, m = this.length; ++j < m;) {
+    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
+      if (node = group[i]) {
+        subnodes = selector.call(node.node, node.node.__data__, i);
+        subgroups.push(subgroup = []);
+        for (var k = -1, o = subnodes.length; ++k < o;) {
+          subgroup.push({node: subnodes[k], delay: node.delay, duration: node.duration});
+        }
+      }
+    }
+  }
+
+  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
+};
+d3_transitionPrototype.attr = function(name, value) {
+  return this.attrTween(name, d3_transitionTween(name, value));
+};
+
+d3_transitionPrototype.attrTween = function(nameNS, tween) {
+  var name = d3.ns.qualify(nameNS);
+
+  function attrTween(d, i) {
+    var f = tween.call(this, d, i, this.getAttribute(name));
+    return f === d3_transitionRemove
+        ? (this.removeAttribute(name), null)
+        : f && function(t) { this.setAttribute(name, f(t)); };
+  }
+
+  function attrTweenNS(d, i) {
+    var f = tween.call(this, d, i, this.getAttributeNS(name.space, name.local));
+    return f === d3_transitionRemove
+        ? (this.removeAttributeNS(name.space, name.local), null)
+        : f && function(t) { this.setAttributeNS(name.space, name.local, f(t)); };
+  }
+
+  return this.tween("attr." + nameNS, name.local ? attrTweenNS : attrTween);
+};
+d3_transitionPrototype.style = function(name, value, priority) {
+  if (arguments.length < 3) priority = "";
+  return this.styleTween(name, d3_transitionTween(name, value), priority);
+};
+
+d3_transitionPrototype.styleTween = function(name, tween, priority) {
+  if (arguments.length < 3) priority = "";
+  return this.tween("style." + name, function(d, i) {
+    var f = tween.call(this, d, i, window.getComputedStyle(this, null).getPropertyValue(name));
+    return f === d3_transitionRemove
+        ? (this.style.removeProperty(name), null)
+        : f && function(t) { this.style.setProperty(name, f(t), priority); };
+  });
+};
+d3_transitionPrototype.text = function(value) {
+  return this.tween("text", function(d, i) {
+    this.textContent = typeof value === "function"
+        ? value.call(this, d, i)
+        : value;
+  });
+};
+d3_transitionPrototype.remove = function() {
+  return this.each("end.transition", function() {
+    var p;
+    if (!this.__transition__ && (p = this.parentNode)) p.removeChild(this);
+  });
+};
+d3_transitionPrototype.delay = function(value) {
+  var groups = this;
+  return groups.each(typeof value === "function"
+      ? function(d, i, j) { groups[j][i].delay = value.apply(this, arguments) | 0; }
+      : (value = value | 0, function(d, i, j) { groups[j][i].delay = value; }));
+};
+d3_transitionPrototype.duration = function(value) {
+  var groups = this;
+  return groups.each(typeof value === "function"
+      ? function(d, i, j) { groups[j][i].duration = Math.max(1, value.apply(this, arguments) | 0); }
+      : (value = Math.max(1, value | 0), function(d, i, j) { groups[j][i].duration = value; }));
+};
+function d3_transition_each(callback) {
+  var id = d3_transitionId,
+      ease = d3_transitionEase,
+      delay = d3_transitionDelay,
+      duration = d3_transitionDuration;
+
+  d3_transitionId = this.id;
+  d3_transitionEase = this.ease();
+  for (var j = 0, m = this.length; j < m; j++) {
+    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
+      var node = group[i];
+      if (node) {
+        d3_transitionDelay = this[j][i].delay;
+        d3_transitionDuration = this[j][i].duration;
+        callback.call(node = node.node, node.__data__, i, j);
+      }
+    }
+  }
+
+  d3_transitionId = id;
+  d3_transitionEase = ease;
+  d3_transitionDelay = delay;
+  d3_transitionDuration = duration;
+  return this;
+}
+d3_transitionPrototype.transition = function() {
+  return this.select(d3_this);
+};
+var d3_timer_queue = null,
+    d3_timer_interval, // is an interval (or frame) active?
+    d3_timer_timeout; // is a timeout active?
+
+// The timer will continue to fire until callback returns true.
+d3.timer = function(callback, delay, then) {
+  var found = false,
+      t0,
+      t1 = d3_timer_queue;
+
+  if (arguments.length < 3) {
+    if (arguments.length < 2) delay = 0;
+    else if (!isFinite(delay)) return;
+    then = Date.now();
+  }
+
+  // See if the callback's already in the queue.
+  while (t1) {
+    if (t1.callback === callback) {
+      t1.then = then;
+      t1.delay = delay;
+      found = true;
+      break;
+    }
+    t0 = t1;
+    t1 = t1.next;
+  }
+
+  // Otherwise, add the callback to the queue.
+  if (!found) d3_timer_queue = {
+    callback: callback,
+    then: then,
+    delay: delay,
+    next: d3_timer_queue
+  };
+
+  // Start animatin'!
+  if (!d3_timer_interval) {
+    d3_timer_timeout = clearTimeout(d3_timer_timeout);
+    d3_timer_interval = 1;
+    d3_timer_frame(d3_timer_step);
+  }
+}
+
+function d3_timer_step() {
+  var elapsed,
+      now = Date.now(),
+      t1 = d3_timer_queue;
+
+  while (t1) {
+    elapsed = now - t1.then;
+    if (elapsed >= t1.delay) t1.flush = t1.callback(elapsed);
+    t1 = t1.next;
+  }
+
+  var delay = d3_timer_flush() - now;
+  if (delay > 24) {
+    if (isFinite(delay)) {
+      clearTimeout(d3_timer_timeout);
+      d3_timer_timeout = setTimeout(d3_timer_step, delay);
+    }
+    d3_timer_interval = 0;
+  } else {
+    d3_timer_interval = 1;
+    d3_timer_frame(d3_timer_step);
+  }
+}
+
+d3.timer.flush = function() {
+  var elapsed,
+      now = Date.now(),
+      t1 = d3_timer_queue;
+
+  while (t1) {
+    elapsed = now - t1.then;
+    if (!t1.delay) t1.flush = t1.callback(elapsed);
+    t1 = t1.next;
+  }
+
+  d3_timer_flush();
+};
+
+// Flush after callbacks, to avoid concurrent queue modification.
+function d3_timer_flush() {
+  var t0 = null,
+      t1 = d3_timer_queue,
+      then = Infinity;
+  while (t1) {
+    if (t1.flush) {
+      t1 = t0 ? t0.next = t1.next : d3_timer_queue = t1.next;
+    } else {
+      then = Math.min(then, t1.then + t1.delay);
+      t1 = (t0 = t1).next;
+    }
+  }
+  return then;
+}
+
+var d3_timer_frame = window.requestAnimationFrame
+    || window.webkitRequestAnimationFrame
+    || window.mozRequestAnimationFrame
+    || window.oRequestAnimationFrame
+    || window.msRequestAnimationFrame
+    || function(callback) { setTimeout(callback, 17); };
+d3.transform = function(string) {
+  var g = document.createElementNS(d3.ns.prefix.svg, "g"),
+      identity = {a: 1, b: 0, c: 0, d: 1, e: 0, f: 0};
+  return (d3.transform = function(string) {
+    g.setAttribute("transform", string);
+    var t = g.transform.baseVal.consolidate();
+    return new d3_transform(t ? t.matrix : identity);
+  })(string);
+};
+
+// Compute x-scale and normalize the first row.
+// Compute shear and make second row orthogonal to first.
+// Compute y-scale and normalize the second row.
+// Finally, compute the rotation.
+function d3_transform(m) {
+  var r0 = [m.a, m.b],
+      r1 = [m.c, m.d],
+      kx = d3_transformNormalize(r0),
+      kz = d3_transformDot(r0, r1),
+      ky = d3_transformNormalize(d3_transformCombine(r1, r0, -kz)) || 0;
+  if (r0[0] * r1[1] < r1[0] * r0[1]) {
+    r0[0] *= -1;
+    r0[1] *= -1;
+    kx *= -1;
+    kz *= -1;
+  }
+  this.rotate = (kx ? Math.atan2(r0[1], r0[0]) : Math.atan2(-r1[0], r1[1])) * d3_transformDegrees;
+  this.translate = [m.e, m.f];
+  this.scale = [kx, ky];
+  this.skew = ky ? Math.atan2(kz, ky) * d3_transformDegrees : 0;
+};
+
+d3_transform.prototype.toString = function() {
+  return "translate(" + this.translate
+      + ")rotate(" + this.rotate
+      + ")skewX(" + this.skew
+      + ")scale(" + this.scale
+      + ")";
+};
+
+function d3_transformDot(a, b) {
+  return a[0] * b[0] + a[1] * b[1];
+}
+
+function d3_transformNormalize(a) {
+  var k = Math.sqrt(d3_transformDot(a, a));
+  if (k) {
+    a[0] /= k;
+    a[1] /= k;
+  }
+  return k;
+}
+
+function d3_transformCombine(a, b, k) {
+  a[0] += k * b[0];
+  a[1] += k * b[1];
+  return a;
+}
+
+var d3_transformDegrees = 180 / Math.PI;
+d3.mouse = function(container) {
+  return d3_mousePoint(container, d3_eventSource());
+};
+
+// https://bugs.webkit.org/show_bug.cgi?id=44083
+var d3_mouse_bug44083 = /WebKit/.test(navigator.userAgent) ? -1 : 0;
+
+function d3_mousePoint(container, e) {
+  var svg = container.ownerSVGElement || container;
+  if (svg.createSVGPoint) {
+    var point = svg.createSVGPoint();
+    if ((d3_mouse_bug44083 < 0) && (window.scrollX || window.scrollY)) {
+      svg = d3.select(document.body)
+        .append("svg")
+          .style("position", "absolute")
+          .style("top", 0)
+          .style("left", 0);
+      var ctm = svg[0][0].getScreenCTM();
+      d3_mouse_bug44083 = !(ctm.f || ctm.e);
+      svg.remove();
+    }
+    if (d3_mouse_bug44083) {
+      point.x = e.pageX;
+      point.y = e.pageY;
+    } else {
+      point.x = e.clientX;
+      point.y = e.clientY;
+    }
+    point = point.matrixTransform(container.getScreenCTM().inverse());
+    return [point.x, point.y];
+  }
+  var rect = container.getBoundingClientRect();
+  return [e.clientX - rect.left - container.clientLeft, e.clientY - rect.top - container.clientTop];
+};
+d3.touches = function(container, touches) {
+  if (arguments.length < 2) touches = d3_eventSource().touches;
+  return touches ? d3_array(touches).map(function(touch) {
+    var point = d3_mousePoint(container, touch);
+    point.identifier = touch.identifier;
+    return point;
+  }) : [];
+};
+function d3_noop() {}
+d3.scale = {};
+
+function d3_scaleExtent(domain) {
+  var start = domain[0], stop = domain[domain.length - 1];
+  return start < stop ? [start, stop] : [stop, start];
+}
+
+function d3_scaleRange(scale) {
+  return scale.rangeExtent ? scale.rangeExtent() : d3_scaleExtent(scale.range());
+}
+function d3_scale_nice(domain, nice) {
+  var i0 = 0,
+      i1 = domain.length - 1,
+      x0 = domain[i0],
+      x1 = domain[i1],
+      dx;
+
+  if (x1 < x0) {
+    dx = i0; i0 = i1; i1 = dx;
+    dx = x0; x0 = x1; x1 = dx;
+  }
+
+  if (dx = x1 - x0) {
+    nice = nice(dx);
+    domain[i0] = nice.floor(x0);
+    domain[i1] = nice.ceil(x1);
+  }
+
+  return domain;
+}
+
+function d3_scale_niceDefault() {
+  return Math;
+}
+d3.scale.linear = function() {
+  return d3_scale_linear([0, 1], [0, 1], d3.interpolate, false);
+};
+
+function d3_scale_linear(domain, range, interpolate, clamp) {
+  var output,
+      input;
+
+  function rescale() {
+    var linear = Math.min(domain.length, range.length) > 2 ? d3_scale_polylinear : d3_scale_bilinear,
+        uninterpolate = clamp ? d3_uninterpolateClamp : d3_uninterpolateNumber;
+    output = linear(domain, range, uninterpolate, interpolate);
+    input = linear(range, domain, uninterpolate, d3.interpolate);
+    return scale;
+  }
+
+  function scale(x) {
+    return output(x);
+  }
+
+  // Note: requires range is coercible to number!
+  scale.invert = function(y) {
+    return input(y);
+  };
+
+  scale.domain = function(x) {
+    if (!arguments.length) return domain;
+    domain = x.map(Number);
+    return rescale();
+  };
+
+  scale.range = function(x) {
+    if (!arguments.length) return range;
+    range = x;
+    return rescale();
+  };
+
+  scale.rangeRound = function(x) {
+    return scale.range(x).interpolate(d3.interpolateRound);
+  };
+
+  scale.clamp = function(x) {
+    if (!arguments.length) return clamp;
+    clamp = x;
+    return rescale();
+  };
+
+  scale.interpolate = function(x) {
+    if (!arguments.length) return interpolate;
+    interpolate = x;
+    return rescale();
+  };
+
+  scale.ticks = function(m) {
+    return d3_scale_linearTicks(domain, m);
+  };
+
+  scale.tickFormat = function(m) {
+    return d3_scale_linearTickFormat(domain, m);
+  };
+
+  scale.nice = function() {
+    d3_scale_nice(domain, d3_scale_linearNice);
+    return rescale();
+  };
+
+  scale.copy = function() {
+    return d3_scale_linear(domain, range, interpolate, clamp);
+  };
+
+  return rescale();
+}
+
+function d3_scale_linearRebind(scale, linear) {
+  return d3.rebind(scale, linear, "range", "rangeRound", "interpolate", "clamp");
+}
+
+function d3_scale_linearNice(dx) {
+  dx = Math.pow(10, Math.round(Math.log(dx) / Math.LN10) - 1);
+  return {
+    floor: function(x) { return Math.floor(x / dx) * dx; },
+    ceil: function(x) { return Math.ceil(x / dx) * dx; }
+  };
+}
+
+function d3_scale_linearTickRange(domain, m) {
+  var extent = d3_scaleExtent(domain),
+      span = extent[1] - extent[0],
+      step = Math.pow(10, Math.floor(Math.log(span / m) / Math.LN10)),
+      err = m / span * step;
+
+  // Filter ticks to get closer to the desired count.
+  if (err <= .15) step *= 10;
+  else if (err <= .35) step *= 5;
+  else if (err <= .75) step *= 2;
+
+  // Round start and stop values to step interval.
+  extent[0] = Math.ceil(extent[0] / step) * step;
+  extent[1] = Math.floor(extent[1] / step) * step + step * .5; // inclusive
+  extent[2] = step;
+  return extent;
+}
+
+function d3_scale_linearTicks(domain, m) {
+  return d3.range.apply(d3, d3_scale_linearTickRange(domain, m));
+}
+
+function d3_scale_linearTickFormat(domain, m) {
+  return d3.format(",." + Math.max(0, -Math.floor(Math.log(d3_scale_linearTickRange(domain, m)[2]) / Math.LN10 + .01)) + "f");
+}
+function d3_scale_bilinear(domain, range, uninterpolate, interpolate) {
+  var u = uninterpolate(domain[0], domain[1]),
+      i = interpolate(range[0], range[1]);
+  return function(x) {
+    return i(u(x));
+  };
+}
+function d3_scale_polylinear(domain, range, uninterpolate, interpolate) {
+  var u = [],
+      i = [],
+      j = 0,
+      k = Math.min(domain.length, range.length) - 1;
+
+  // Handle descending domains.
+  if (domain[k] < domain[0]) {
+    domain = domain.slice().reverse();
+    range = range.slice().reverse();
+  }
+
+  while (++j <= k) {
+    u.push(uninterpolate(domain[j - 1], domain[j]));
+    i.push(interpolate(range[j - 1], range[j]));
+  }
+
+  return function(x) {
+    var j = d3.bisect(domain, x, 1, k) - 1;
+    return i[j](u[j](x));
+  };
+}
+d3.scale.log = function() {
+  return d3_scale_log(d3.scale.linear(), d3_scale_logp);
+};
+
+function d3_scale_log(linear, log) {
+  var pow = log.pow;
+
+  function scale(x) {
+    return linear(log(x));
+  }
+
+  scale.invert = function(x) {
+    return pow(linear.invert(x));
+  };
+
+  scale.domain = function(x) {
+    if (!arguments.length) return linear.domain().map(pow);
+    log = x[0] < 0 ? d3_scale_logn : d3_scale_logp;
+    pow = log.pow;
+    linear.domain(x.map(log));
+    return scale;
+  };
+
+  scale.nice = function() {
+    linear.domain(d3_scale_nice(linear.domain(), d3_scale_niceDefault));
+    return scale;
+  };
+
+  scale.ticks = function() {
+    var extent = d3_scaleExtent(linear.domain()),
+        ticks = [];
+    if (extent.every(isFinite)) {
+      var i = Math.floor(extent[0]),
+          j = Math.ceil(extent[1]),
+          u = pow(extent[0]),
+          v = pow(extent[1]);
+      if (log === d3_scale_logn) {
+        ticks.push(pow(i));
+        for (; i++ < j;) for (var k = 9; k > 0; k--) ticks.push(pow(i) * k);
+      } else {
+        for (; i < j; i++) for (var k = 1; k < 10; k++) ticks.push(pow(i) * k);
+        ticks.push(pow(i));
+      }
+      for (i = 0; ticks[i] < u; i++) {} // strip small values
+      for (j = ticks.length; ticks[j - 1] > v; j--) {} // strip big values
+      ticks = ticks.slice(i, j);
+    }
+    return ticks;
+  };
+
+  scale.tickFormat = function(n, format) {
+    if (arguments.length < 2) format = d3_scale_logFormat;
+    if (arguments.length < 1) return format;
+    var k = n / scale.ticks().length,
+        f = log === d3_scale_logn ? (e = -1e-12, Math.floor) : (e = 1e-12, Math.ceil),
+        e;
+    return function(d) {
+      return d / pow(f(log(d) + e)) < k ? format(d) : "";
+    };
+  };
+
+  scale.copy = function() {
+    return d3_scale_log(linear.copy(), log);
+  };
+
+  return d3_scale_linearRebind(scale, linear);
+}
+
+var d3_scale_logFormat = d3.format(".0e");
+
+function d3_scale_logp(x) {
+  return Math.log(x < 0 ? 0 : x) / Math.LN10;
+}
+
+function d3_scale_logn(x) {
+  return -Math.log(x > 0 ? 0 : -x) / Math.LN10;
+}
+
+d3_scale_logp.pow = function(x) {
+  return Math.pow(10, x);
+};
+
+d3_scale_logn.pow = function(x) {
+  return -Math.pow(10, -x);
+};
+d3.scale.pow = function() {
+  return d3_scale_pow(d3.scale.linear(), 1);
+};
+
+function d3_scale_pow(linear, exponent) {
+  var powp = d3_scale_powPow(exponent),
+      powb = d3_scale_powPow(1 / exponent);
+
+  function scale(x) {
+    return linear(powp(x));
+  }
+
+  scale.invert = function(x) {
+    return powb(linear.invert(x));
+  };
+
+  scale.domain = function(x) {
+    if (!arguments.length) return linear.domain().map(powb);
+    linear.domain(x.map(powp));
+    return scale;
+  };
+
+  scale.ticks = function(m) {
+    return d3_scale_linearTicks(scale.domain(), m);
+  };
+
+  scale.tickFormat = function(m) {
+    return d3_scale_linearTickFormat(scale.domain(), m);
+  };
+
+  scale.nice = function() {
+    return scale.domain(d3_scale_nice(scale.domain(), d3_scale_linearNice));
+  };
+
+  scale.exponent = function(x) {
+    if (!arguments.length) return exponent;
+    var domain = scale.domain();
+    powp = d3_scale_powPow(exponent = x);
+    powb = d3_scale_powPow(1 / exponent);
+    return scale.domain(domain);
+  };
+
+  scale.copy = function() {
+    return d3_scale_pow(linear.copy(), exponent);
+  };
+
+  return d3_scale_linearRebind(scale, linear);
+}
+
+function d3_scale_powPow(e) {
+  return function(x) {
+    return x < 0 ? -Math.pow(-x, e) : Math.pow(x, e);
+  };
+}
+d3.scale.sqrt = function() {
+  return d3.scale.pow().exponent(.5);
+};
+d3.scale.ordinal = function() {
+  return d3_scale_ordinal([], {t: "range", x: []});
+};
+
+function d3_scale_ordinal(domain, ranger) {
+  var index,
+      range,
+      rangeBand;
+
+  function scale(x) {
+    return range[((index.get(x) || index.set(x, domain.push(x))) - 1) % range.length];
+  }
+
+  function steps(start, step) {
+    return d3.range(domain.length).map(function(i) { return start + step * i; });
+  }
+
+  scale.domain = function(x) {
+    if (!arguments.length) return domain;
+    domain = [];
+    index = new d3_Map;
+    var i = -1, n = x.length, xi;
+    while (++i < n) if (!index.has(xi = x[i])) index.set(xi, domain.push(xi));
+    return scale[ranger.t](ranger.x, ranger.p);
+  };
+
+  scale.range = function(x) {
+    if (!arguments.length) return range;
+    range = x;
+    rangeBand = 0;
+    ranger = {t: "range", x: x};
+    return scale;
+  };
+
+  scale.rangePoints = function(x, padding) {
+    if (arguments.length < 2) padding = 0;
+    var start = x[0],
+        stop = x[1],
+        step = (stop - start) / (domain.length - 1 + padding);
+    range = steps(domain.length < 2 ? (start + stop) / 2 : start + step * padding / 2, step);
+    rangeBand = 0;
+    ranger = {t: "rangePoints", x: x, p: padding};
+    return scale;
+  };
+
+  scale.rangeBands = function(x, padding) {
+    if (arguments.length < 2) padding = 0;
+    var reverse = x[1] < x[0],
+        start = x[reverse - 0],
+        stop = x[1 - reverse],
+        step = (stop - start) / (domain.length + padding);
+    range = steps(start + step * padding, step);
+    if (reverse) range.reverse();
+    rangeBand = step * (1 - padding);
+    ranger = {t: "rangeBands", x: x, p: padding};
+    return scale;
+  };
+
+  scale.rangeRoundBands = function(x, padding) {
+    if (arguments.length < 2) padding = 0;
+    var reverse = x[1] < x[0],
+        start = x[reverse - 0],
+        stop = x[1 - reverse],
+        step = Math.floor((stop - start) / (domain.length + padding)),
+        error = stop - start - (domain.length - padding) * step;
+    range = steps(start + Math.round(error / 2), step);
+    if (reverse) range.reverse();
+    rangeBand = Math.round(step * (1 - padding));
+    ranger = {t: "rangeRoundBands", x: x, p: padding};
+    return scale;
+  };
+
+  scale.rangeBand = function() {
+    return rangeBand;
+  };
+
+  scale.rangeExtent = function() {
+    return d3_scaleExtent(ranger.x);
+  };
+
+  scale.copy = function() {
+    return d3_scale_ordinal(domain, ranger);
+  };
+
+  return scale.domain(domain);
+}
+/*
+ * This product includes color specifications and designs developed by Cynthia
+ * Brewer (http://colorbrewer.org/). See lib/colorbrewer for more information.
+ */
+
+d3.scale.category10 = function() {
+  return d3.scale.ordinal().range(d3_category10);
+};
+
+d3.scale.category20 = function() {
+  return d3.scale.ordinal().range(d3_category20);
+};
+
+d3.scale.category20b = function() {
+  return d3.scale.ordinal().range(d3_category20b);
+};
+
+d3.scale.category20c = function() {
+  return d3.scale.ordinal().range(d3_category20c);
+};
+
+var d3_category10 = [
+  "#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd",
+  "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"
+];
+
+var d3_category20 = [
+  "#1f77b4", "#aec7e8",
+  "#ff7f0e", "#ffbb78",
+  "#2ca02c", "#98df8a",
+  "#d62728", "#ff9896",
+  "#9467bd", "#c5b0d5",
+  "#8c564b", "#c49c94",
+  "#e377c2", "#f7b6d2",
+  "#7f7f7f", "#c7c7c7",
+  "#bcbd22", "#dbdb8d",
+  "#17becf", "#9edae5"
+];
+
+var d3_category20b = [
+  "#393b79", "#5254a3", "#6b6ecf", "#9c9ede",
+  "#637939", "#8ca252", "#b5cf6b", "#cedb9c",
+  "#8c6d31", "#bd9e39", "#e7ba52", "#e7cb94",
+  "#843c39", "#ad494a", "#d6616b", "#e7969c",
+  "#7b4173", "#a55194", "#ce6dbd", "#de9ed6"
+];
+
+var d3_category20c = [
+  "#3182bd", "#6baed6", "#9ecae1", "#c6dbef",
+  "#e6550d", "#fd8d3c", "#fdae6b", "#fdd0a2",
+  "#31a354", "#74c476", "#a1d99b", "#c7e9c0",
+  "#756bb1", "#9e9ac8", "#bcbddc", "#dadaeb",
+  "#636363", "#969696", "#bdbdbd", "#d9d9d9"
+];
+d3.scale.quantile = function() {
+  return d3_scale_quantile([], []);
+};
+
+function d3_scale_quantile(domain, range) {
+  var thresholds;
+
+  function rescale() {
+    var k = 0,
+        n = domain.length,
+        q = range.length;
+    thresholds = [];
+    while (++k < q) thresholds[k - 1] = d3.quantile(domain, k / q);
+    return scale;
+  }
+
+  function scale(x) {
+    if (isNaN(x = +x)) return NaN;
+    return range[d3.bisect(thresholds, x)];
+  }
+
+  scale.domain = function(x) {
+    if (!arguments.length) return domain;
+    domain = x.filter(function(d) { return !isNaN(d); }).sort(d3.ascending);
+    return rescale();
+  };
+
+  scale.range = function(x) {
+    if (!arguments.length) return range;
+    range = x;
+    return rescale();
+  };
+
+  scale.quantiles = function() {
+    return thresholds;
+  };
+
+  scale.copy = function() {
+    return d3_scale_quantile(domain, range); // copy on write!
+  };
+
+  return rescale();
+}
+d3.scale.quantize = function() {
+  return d3_scale_quantize(0, 1, [0, 1]);
+};
+
+function d3_scale_quantize(x0, x1, range) {
+  var kx, i;
+
+  function scale(x) {
+    return range[Math.max(0, Math.min(i, Math.floor(kx * (x - x0))))];
+  }
+
+  function rescale() {
+    kx = range.length / (x1 - x0);
+    i = range.length - 1;
+    return scale;
+  }
+
+  scale.domain = function(x) {
+    if (!arguments.length) return [x0, x1];
+    x0 = +x[0];
+    x1 = +x[x.length - 1];
+    return rescale();
+  };
+
+  scale.range = function(x) {
+    if (!arguments.length) return range;
+    range = x;
+    return rescale();
+  };
+
+  scale.copy = function() {
+    return d3_scale_quantize(x0, x1, range); // copy on write
+  };
+
+  return rescale();
+}
+d3.scale.identity = function() {
+  return d3_scale_identity([0, 1]);
+};
+
+function d3_scale_identity(domain) {
+
+  function identity(x) { return +x; }
+
+  identity.invert = identity;
+
+  identity.domain = identity.range = function(x) {
+    if (!arguments.length) return domain;
+    domain = x.map(identity);
+    return identity;
+  };
+
+  identity.ticks = function(m) {
+    return d3_scale_linearTicks(domain, m);
+  };
+
+  identity.tickFormat = function(m) {
+    return d3_scale_linearTickFormat(domain, m);
+  };
+
+  identity.copy = function() {
+    return d3_scale_identity(domain);
+  };
+
+  return identity;
+}
+d3.svg = {};
+d3.svg.arc = function() {
+  var innerRadius = d3_svg_arcInnerRadius,
+      outerRadius = d3_svg_arcOuterRadius,
+      startAngle = d3_svg_arcStartAngle,
+      endAngle = d3_svg_arcEndAngle;
+
+  function arc() {
+    var r0 = innerRadius.apply(this, arguments),
+        r1 = outerRadius.apply(this, arguments),
+        a0 = startAngle.apply(this, arguments) + d3_svg_arcOffset,
+        a1 = endAngle.apply(this, arguments) + d3_svg_arcOffset,
+        da = (a1 < a0 && (da = a0, a0 = a1, a1 = da), a1 - a0),
+        df = da < Math.PI ? "0" : "1",
+        c0 = Math.cos(a0),
+        s0 = Math.sin(a0),
+        c1 = Math.cos(a1),
+        s1 = Math.sin(a1);
+    return da >= d3_svg_arcMax
+      ? (r0
+      ? "M0," + r1
+      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
+      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
+      + "M0," + r0
+      + "A" + r0 + "," + r0 + " 0 1,0 0," + (-r0)
+      + "A" + r0 + "," + r0 + " 0 1,0 0," + r0
+      + "Z"
+      : "M0," + r1
+      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
+      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
+      + "Z")
+      : (r0
+      ? "M" + r1 * c0 + "," + r1 * s0
+      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
+      + "L" + r0 * c1 + "," + r0 * s1
+      + "A" + r0 + "," + r0 + " 0 " + df + ",0 " + r0 * c0 + "," + r0 * s0
+      + "Z"
+      : "M" + r1 * c0 + "," + r1 * s0
+      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
+      + "L0,0"
+      + "Z");
+  }
+
+  arc.innerRadius = function(v) {
+    if (!arguments.length) return innerRadius;
+    innerRadius = d3.functor(v);
+    return arc;
+  };
+
+  arc.outerRadius = function(v) {
+    if (!arguments.length) return outerRadius;
+    outerRadius = d3.functor(v);
+    return arc;
+  };
+
+  arc.startAngle = function(v) {
+    if (!arguments.length) return startAngle;
+    startAngle = d3.functor(v);
+    return arc;
+  };
+
+  arc.endAngle = function(v) {
+    if (!arguments.length) return endAngle;
+    endAngle = d3.functor(v);
+    return arc;
+  };
+
+  arc.centroid = function() {
+    var r = (innerRadius.apply(this, arguments)
+        + outerRadius.apply(this, arguments)) / 2,
+        a = (startAngle.apply(this, arguments)
+        + endAngle.apply(this, arguments)) / 2 + d3_svg_arcOffset;
+    return [Math.cos(a) * r, Math.sin(a) * r];
+  };
+
+  return arc;
+};
+
+var d3_svg_arcOffset = -Math.PI / 2,
+    d3_svg_arcMax = 2 * Math.PI - 1e-6;
+
+function d3_svg_arcInnerRadius(d) {
+  return d.innerRadius;
+}
+
+function d3_svg_arcOuterRadius(d) {
+  return d.outerRadius;
+}
+
+function d3_svg_arcStartAngle(d) {
+  return d.startAngle;
+}
+
+function d3_svg_arcEndAngle(d) {
+  return d.endAngle;
+}
+function d3_svg_line(projection) {
+  var x = d3_svg_lineX,
+      y = d3_svg_lineY,
+      interpolate = d3_svg_lineInterpolatorDefault,
+      interpolator = d3_svg_lineInterpolators.get(interpolate),
+      tension = .7;
+
+  function line(d) {
+    return d.length < 1 ? null : "M" + interpolator(projection(d3_svg_linePoints(this, d, x, y)), tension);
+  }
+
+  line.x = function(v) {
+    if (!arguments.length) return x;
+    x = v;
+    return line;
+  };
+
+  line.y = function(v) {
+    if (!arguments.length) return y;
+    y = v;
+    return line;
+  };
+
+  line.interpolate = function(v) {
+    if (!arguments.length) return interpolate;
+    if (!d3_svg_lineInterpolators.has(v += "")) v = d3_svg_lineInterpolatorDefault;
+    interpolator = d3_svg_lineInterpolators.get(interpolate = v);
+    return line;
+  };
+
+  line.tension = function(v) {
+    if (!arguments.length) return tension;
+    tension = v;
+    return line;
+  };
+
+  return line;
+}
+
+d3.svg.line = function() {
+  return d3_svg_line(Object);
+};
+
+// Converts the specified array of data into an array of points
+// (x-y tuples), by evaluating the specified `x` and `y` functions on each
+// data point. The `this` context of the evaluated functions is the specified
+// "self" object; each function is passed the current datum and index.
+function d3_svg_linePoints(self, d, x, y) {
+  var points = [],
+      i = -1,
+      n = d.length,
+      fx = typeof x === "function",
+      fy = typeof y === "function",
+      value;
+  if (fx && fy) {
+    while (++i < n) points.push([
+      x.call(self, value = d[i], i),
+      y.call(self, value, i)
+    ]);
+  } else if (fx) {
+    while (++i < n) points.push([x.call(self, d[i], i), y]);
+  } else if (fy) {
+    while (++i < n) points.push([x, y.call(self, d[i], i)]);
+  } else {
+    while (++i < n) points.push([x, y]);
+  }
+  return points;
+}
+
+// The default `x` property, which references d[0].
+function d3_svg_lineX(d) {
+  return d[0];
+}
+
+// The default `y` property, which references d[1].
+function d3_svg_lineY(d) {
+  return d[1];
+}
+
+var d3_svg_lineInterpolatorDefault = "linear";
+
+// The various interpolators supported by the `line` class.
+var d3_svg_lineInterpolators = d3.map({
+  "linear": d3_svg_lineLinear,
+  "step-before": d3_svg_lineStepBefore,
+  "step-after": d3_svg_lineStepAfter,
+  "basis": d3_svg_lineBasis,
+  "basis-open": d3_svg_lineBasisOpen,
+  "basis-closed": d3_svg_lineBasisClosed,
+  "bundle": d3_svg_lineBundle,
+  "cardinal": d3_svg_lineCardinal,
+  "cardinal-open": d3_svg_lineCardinalOpen,
+  "cardinal-closed": d3_svg_lineCardinalClosed,
+  "monotone": d3_svg_lineMonotone
+});
+
+// Linear interpolation; generates "L" commands.
+function d3_svg_lineLinear(points) {
+  var i = 0,
+      n = points.length,
+      p = points[0],
+      path = [p[0], ",", p[1]];
+  while (++i < n) path.push("L", (p = points[i])[0], ",", p[1]);
+  return path.join("");
+}
+
+// Step interpolation; generates "H" and "V" commands.
+function d3_svg_lineStepBefore(points) {
+  var i = 0,
+      n = points.length,
+      p = points[0],
+      path = [p[0], ",", p[1]];
+  while (++i < n) path.push("V", (p = points[i])[1], "H", p[0]);
+  return path.join("");
+}
+
+// Step interpolation; generates "H" and "V" commands.
+function d3_svg_lineStepAfter(points) {
+  var i = 0,
+      n = points.length,
+      p = points[0],
+      path = [p[0], ",", p[1]];
+  while (++i < n) path.push("H", (p = points[i])[0], "V", p[1]);
+  return path.join("");
+}
+
+// Open cardinal spline interpolation; generates "C" commands.
+function d3_svg_lineCardinalOpen(points, tension) {
+  return points.length < 4
+      ? d3_svg_lineLinear(points)
+      : points[1] + d3_svg_lineHermite(points.slice(1, points.length - 1),
+        d3_svg_lineCardinalTangents(points, tension));
+}
+
+// Closed cardinal spline interpolation; generates "C" commands.
+function d3_svg_lineCardinalClosed(points, tension) {
+  return points.length < 3
+      ? d3_svg_lineLinear(points)
+      : points[0] + d3_svg_lineHermite((points.push(points[0]), points),
+        d3_svg_lineCardinalTangents([points[points.length - 2]]
+        .concat(points, [points[1]]), tension));
+}
+
+// Cardinal spline interpolation; generates "C" commands.
+function d3_svg_lineCardinal(points, tension, closed) {
+  return points.length < 3
+      ? d3_svg_lineLinear(points)
+      : points[0] + d3_svg_lineHermite(points,
+        d3_svg_lineCardinalTangents(points, tension));
+}
+
+// Hermite spline construction; generates "C" commands.
+function d3_svg_lineHermite(points, tangents) {
+  if (tangents.length < 1
+      || (points.length != tangents.length
+      && points.length != tangents.length + 2)) {
+    return d3_svg_lineLinear(points);
+  }
+
+  var quad = points.length != tangents.length,
+      path = "",
+      p0 = points[0],
+      p = points[1],
+      t0 = tangents[0],
+      t = t0,
+      pi = 1;
+
+  if (quad) {
+    path += "Q" + (p[0] - t0[0] * 2 / 3) + "," + (p[1] - t0[1] * 2 / 3)
+        + "," + p[0] + "," + p[1];
+    p0 = points[1];
+    pi = 2;
+  }
+
+  if (tangents.length > 1) {
+    t = tangents[1];
+    p = points[pi];
+    pi++;
+    path += "C" + (p0[0] + t0[0]) + "," + (p0[1] + t0[1])
+        + "," + (p[0] - t[0]) + "," + (p[1] - t[1])
+        + "," + p[0] + "," + p[1];
+    for (var i = 2; i < tangents.length; i++, pi++) {
+      p = points[pi];
+      t = tangents[i];
+      path += "S" + (p[0] - t[0]) + "," + (p[1] - t[1])
+          + "," + p[0] + "," + p[1];
+    }
+  }
+
+  if (quad) {
+    var lp = points[pi];
+    path += "Q" + (p[0] + t[0] * 2 / 3) + "," + (p[1] + t[1] * 2 / 3)
+        + "," + lp[0] + "," + lp[1];
+  }
+
+  return path;
+}
+
+// Generates tangents for a cardinal spline.
+function d3_svg_lineCardinalTangents(points, tension) {
+  var tangents = [],
+      a = (1 - tension) / 2,
+      p0,
+      p1 = points[0],
+      p2 = points[1],
+      i = 1,
+      n = points.length;
+  while (++i < n) {
+    p0 = p1;
+    p1 = p2;
+    p2 = points[i];
+    tangents.push([a * (p2[0] - p0[0]), a * (p2[1] - p0[1])]);
+  }
+  return tangents;
+}
+
+// B-spline interpolation; generates "C" commands.
+function d3_svg_lineBasis(points) {
+  if (points.length < 3) return d3_svg_lineLinear(points);
+  var i = 1,
+      n = points.length,
+      pi = points[0],
+      x0 = pi[0],
+      y0 = pi[1],
+      px = [x0, x0, x0, (pi = points[1])[0]],
+      py = [y0, y0, y0, pi[1]],
+      path = [x0, ",", y0];
+  d3_svg_lineBasisBezier(path, px, py);
+  while (++i < n) {
+    pi = points[i];
+    px.shift(); px.push(pi[0]);
+    py.shift(); py.push(pi[1]);
+    d3_svg_lineBasisBezier(path, px, py);
+  }
+  i = -1;
+  while (++i < 2) {
+    px.shift(); px.push(pi[0]);
+    py.shift(); py.push(pi[1]);
+    d3_svg_lineBasisBezier(path, px, py);
+  }
+  return path.join("");
+}
+
+// Open B-spline interpolation; generates "C" commands.
+function d3_svg_lineBasisOpen(points) {
+  if (points.length < 4) return d3_svg_lineLinear(points);
+  var path = [],
+      i = -1,
+      n = points.length,
+      pi,
+      px = [0],
+      py = [0];
+  while (++i < 3) {
+    pi = points[i];
+    px.push(pi[0]);
+    py.push(pi[1]);
+  }
+  path.push(d3_svg_lineDot4(d3_svg_lineBasisBezier3, px)
+    + "," + d3_svg_lineDot4(d3_svg_lineBasisBezier3, py));
+  --i; while (++i < n) {
+    pi = points[i];
+    px.shift(); px.push(pi[0]);
+    py.shift(); py.push(pi[1]);
+    d3_svg_lineBasisBezier(path, px, py);
+  }
+  return path.join("");
+}
+
+// Closed B-spline interpolation; generates "C" commands.
+function d3_svg_lineBasisClosed(points) {
+  var path,
+      i = -1,
+      n = points.length,
+      m = n + 4,
+      pi,
+      px = [],
+      py = [];
+  while (++i < 4) {
+    pi = points[i % n];
+    px.push(pi[0]);
+    py.push(pi[1]);
+  }
+  path = [
+    d3_svg_lineDot4(d3_svg_lineBasisBezier3, px), ",",
+    d3_svg_lineDot4(d3_svg_lineBasisBezier3, py)
+  ];
+  --i; while (++i < m) {
+    pi = points[i % n];
+    px.shift(); px.push(pi[0]);
+    py.shift(); py.push(pi[1]);
+    d3_svg_lineBasisBezier(path, px, py);
+  }
+  return path.join("");
+}
+
+function d3_svg_lineBundle(points, tension) {
+  var n = points.length - 1,
+      x0 = points[0][0],
+      y0 = points[0][1],
+      dx = points[n][0] - x0,
+      dy = points[n][1] - y0,
+      i = -1,
+      p,
+      t;
+  while (++i <= n) {
+    p = points[i];
+    t = i / n;
+    p[0] = tension * p[0] + (1 - tension) * (x0 + t * dx);
+    p[1] = tension * p[1] + (1 - tension) * (y0 + t * dy);
+  }
+  return d3_svg_lineBasis(points);
+}
+
+// Returns the dot product of the given four-element vectors.
+function d3_svg_lineDot4(a, b) {
+  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
+}
+
+// Matrix to transform basis (b-spline) control points to bezier
+// control points. Derived from FvD 11.2.8.
+var d3_svg_lineBasisBezier1 = [0, 2/3, 1/3, 0],
+    d3_svg_lineBasisBezier2 = [0, 1/3, 2/3, 0],
+    d3_svg_lineBasisBezier3 = [0, 1/6, 2/3, 1/6];
+
+// Pushes a "C" Bézier curve onto the specified path array, given the
+// two specified four-element arrays which define the control points.
+function d3_svg_lineBasisBezier(path, x, y) {
+  path.push(
+      "C", d3_svg_lineDot4(d3_svg_lineBasisBezier1, x),
+      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier1, y),
+      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, x),
+      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, y),
+      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, x),
+      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, y));
+}
+
+// Computes the slope from points p0 to p1.
+function d3_svg_lineSlope(p0, p1) {
+  return (p1[1] - p0[1]) / (p1[0] - p0[0]);
+}
+
+// Compute three-point differences for the given points.
+// http://en.wikipedia.org/wiki/Cubic_Hermite_spline#Finite_difference
+function d3_svg_lineFiniteDifferences(points) {
+  var i = 0,
+      j = points.length - 1,
+      m = [],
+      p0 = points[0],
+      p1 = points[1],
+      d = m[0] = d3_svg_lineSlope(p0, p1);
+  while (++i < j) {
+    m[i] = d + (d = d3_svg_lineSlope(p0 = p1, p1 = points[i + 1]));
+  }
+  m[i] = d;
+  return m;
+}
+
+// Interpolates the given points using Fritsch-Carlson Monotone cubic Hermite
+// interpolation. Returns an array of tangent vectors. For details, see
+// http://en.wikipedia.org/wiki/Monotone_cubic_interpolation
+function d3_svg_lineMonotoneTangents(points) {
+  var tangents = [],
+      d,
+      a,
+      b,
+      s,
+      m = d3_svg_lineFiniteDifferences(points),
+      i = -1,
+      j = points.length - 1;
+
+  // The first two steps are done by computing finite-differences:
+  // 1. Compute the slopes of the secant lines between successive points.
+  // 2. Initialize the tangents at every point as the average of the secants.
+
+  // Then, for each segment…
+  while (++i < j) {
+    d = d3_svg_lineSlope(points[i], points[i + 1]);
+
+    // 3. If two successive yk = y{k + 1} are equal (i.e., d is zero), then set
+    // mk = m{k + 1} = 0 as the spline connecting these points must be flat to
+    // preserve monotonicity. Ignore step 4 and 5 for those k.
+
+    if (Math.abs(d) < 1e-6) {
+      m[i] = m[i + 1] = 0;
+    } else {
+      // 4. Let ak = mk / dk and bk = m{k + 1} / dk.
+      a = m[i] / d;
+      b = m[i + 1] / d;
+
+      // 5. Prevent overshoot and ensure monotonicity by restricting the
+      // magnitude of vector <ak, bk> to a circle of radius 3.
+      s = a * a + b * b;
+      if (s > 9) {
+        s = d * 3 / Math.sqrt(s);
+        m[i] = s * a;
+        m[i + 1] = s * b;
+      }
+    }
+  }
+
+  // Compute the normalized tangent vector from the slopes. Note that if x is
+  // not monotonic, it's possible that the slope will be infinite, so we protect
+  // against NaN by setting the coordinate to zero.
+  i = -1; while (++i <= j) {
+    s = (points[Math.min(j, i + 1)][0] - points[Math.max(0, i - 1)][0])
+      / (6 * (1 + m[i] * m[i]));
+    tangents.push([s || 0, m[i] * s || 0]);
+  }
+
+  return tangents;
+}
+
+function d3_svg_lineMonotone(points) {
+  return points.length < 3
+      ? d3_svg_lineLinear(points)
+      : points[0] +
+        d3_svg_lineHermite(points, d3_svg_lineMonotoneTangents(points));
+}
+d3.svg.line.radial = function() {
+  var line = d3_svg_line(d3_svg_lineRadial);
+  line.radius = line.x, delete line.x;
+  line.angle = line.y, delete line.y;
+  return line;
+};
+
+function d3_svg_lineRadial(points) {
+  var point,
+      i = -1,
+      n = points.length,
+      r,
+      a;
+  while (++i < n) {
+    point = points[i];
+    r = point[0];
+    a = point[1] + d3_svg_arcOffset;
+    point[0] = r * Math.cos(a);
+    point[1] = r * Math.sin(a);
+  }
+  return points;
+}
+function d3_svg_area(projection) {
+  var x0 = d3_svg_lineX,
+      x1 = d3_svg_lineX,
+      y0 = 0,
+      y1 = d3_svg_lineY,
+      interpolate,
+      i0,
+      i1,
+      tension = .7;
+
+  function area(d) {
+    if (d.length < 1) return null;
+    var points0 = d3_svg_linePoints(this, d, x0, y0),
+        points1 = d3_svg_linePoints(this, d, x0 === x1 ? d3_svg_areaX(points0) : x1, y0 === y1 ? d3_svg_areaY(points0) : y1);
+    return "M" + i0(projection(points1), tension)
+         + "L" + i1(projection(points0.reverse()), tension)
+         + "Z";
+  }
+
+  area.x = function(x) {
+    if (!arguments.length) return x1;
+    x0 = x1 = x;
+    return area;
+  };
+
+  area.x0 = function(x) {
+    if (!arguments.length) return x0;
+    x0 = x;
+    return area;
+  };
+
+  area.x1 = function(x) {
+    if (!arguments.length) return x1;
+    x1 = x;
+    return area;
+  };
+
+  area.y = function(y) {
+    if (!arguments.length) return y1;
+    y0 = y1 = y;
+    return area;
+  };
+
+  area.y0 = function(y) {
+    if (!arguments.length) return y0;
+    y0 = y;
+    return area;
+  };
+
+  area.y1 = function(y) {
+    if (!arguments.length) return y1;
+    y1 = y;
+    return area;
+  };
+
+  area.interpolate = function(x) {
+    if (!arguments.length) return interpolate;
+    if (!d3_svg_lineInterpolators.has(x += "")) x = d3_svg_lineInterpolatorDefault;
+    i0 = d3_svg_lineInterpolators.get(interpolate = x);
+    i1 = i0.reverse || i0;
+    return area;
+  };
+
+  area.tension = function(x) {
+    if (!arguments.length) return tension;
+    tension = x;
+    return area;
+  };
+
+  return area.interpolate("linear");
+}
+
+d3_svg_lineStepBefore.reverse = d3_svg_lineStepAfter;
+d3_svg_lineStepAfter.reverse = d3_svg_lineStepBefore;
+
+d3.svg.area = function() {
+  return d3_svg_area(Object);
+};
+
+function d3_svg_areaX(points) {
+  return function(d, i) {
+    return points[i][0];
+  };
+}
+
+function d3_svg_areaY(points) {
+  return function(d, i) {
+    return points[i][1];
+  };
+}
+d3.svg.area.radial = function() {
+  var area = d3_svg_area(d3_svg_lineRadial);
+  area.radius = area.x, delete area.x;
+  area.innerRadius = area.x0, delete area.x0;
+  area.outerRadius = area.x1, delete area.x1;
+  area.angle = area.y, delete area.y;
+  area.startAngle = area.y0, delete area.y0;
+  area.endAngle = area.y1, delete area.y1;
+  return area;
+};
+d3.svg.chord = function() {
+  var source = d3_svg_chordSource,
+      target = d3_svg_chordTarget,
+      radius = d3_svg_chordRadius,
+      startAngle = d3_svg_arcStartAngle,
+      endAngle = d3_svg_arcEndAngle;
+
+  // TODO Allow control point to be customized.
+
+  function chord(d, i) {
+    var s = subgroup(this, source, d, i),
+        t = subgroup(this, target, d, i);
+    return "M" + s.p0
+      + arc(s.r, s.p1, s.a1 - s.a0) + (equals(s, t)
+      ? curve(s.r, s.p1, s.r, s.p0)
+      : curve(s.r, s.p1, t.r, t.p0)
+      + arc(t.r, t.p1, t.a1 - t.a0)
+      + curve(t.r, t.p1, s.r, s.p0))
+      + "Z";
+  }
+
+  function subgroup(self, f, d, i) {
+    var subgroup = f.call(self, d, i),
+        r = radius.call(self, subgroup, i),
+        a0 = startAngle.call(self, subgroup, i) + d3_svg_arcOffset,
+        a1 = endAngle.call(self, subgroup, i) + d3_svg_arcOffset;
+    return {
+      r: r,
+      a0: a0,
+      a1: a1,
+      p0: [r * Math.cos(a0), r * Math.sin(a0)],
+      p1: [r * Math.cos(a1), r * Math.sin(a1)]
+    };
+  }
+
+  function equals(a, b) {
+    return a.a0 == b.a0 && a.a1 == b.a1;
+  }
+
+  function arc(r, p, a) {
+    return "A" + r + "," + r + " 0 " + +(a > Math.PI) + ",1 " + p;
+  }
+
+  function curve(r0, p0, r1, p1) {
+    return "Q 0,0 " + p1;
+  }
+
+  chord.radius = function(v) {
+    if (!arguments.length) return radius;
+    radius = d3.functor(v);
+    return chord;
+  };
+
+  chord.source = function(v) {
+    if (!arguments.length) return source;
+    source = d3.functor(v);
+    return chord;
+  };
+
+  chord.target = function(v) {
+    if (!arguments.length) return target;
+    target = d3.functor(v);
+    return chord;
+  };
+
+  chord.startAngle = function(v) {
+    if (!arguments.length) return startAngle;
+    startAngle = d3.functor(v);
+    return chord;
+  };
+
+  chord.endAngle = function(v) {
+    if (!arguments.length) return endAngle;
+    endAngle = d3.functor(v);
+    return chord;
+  };
+
+  return chord;
+};
+
+function d3_svg_chordSource(d) {
+  return d.source;
+}
+
+function d3_svg_chordTarget(d) {
+  return d.target;
+}
+
+function d3_svg_chordRadius(d) {
+  return d.radius;
+}
+
+function d3_svg_chordStartAngle(d) {
+  return d.startAngle;
+}
+
+function d3_svg_chordEndAngle(d) {
+  return d.endAngle;
+}
+d3.svg.diagonal = function() {
+  var source = d3_svg_chordSource,
+      target = d3_svg_chordTarget,
+      projection = d3_svg_diagonalProjection;
+
+  function diagonal(d, i) {
+    var p0 = source.call(this, d, i),
+        p3 = target.call(this, d, i),
+        m = (p0.y + p3.y) / 2,
+        p = [p0, {x: p0.x, y: m}, {x: p3.x, y: m}, p3];
+    p = p.map(projection);
+    return "M" + p[0] + "C" + p[1] + " " + p[2] + " " + p[3];
+  }
+
+  diagonal.source = function(x) {
+    if (!arguments.length) return source;
+    source = d3.functor(x);
+    return diagonal;
+  };
+
+  diagonal.target = function(x) {
+    if (!arguments.length) return target;
+    target = d3.functor(x);
+    return diagonal;
+  };
+
+  diagonal.projection = function(x) {
+    if (!arguments.length) return projection;
+    projection = x;
+    return diagonal;
+  };
+
+  return diagonal;
+};
+
+function d3_svg_diagonalProjection(d) {
+  return [d.x, d.y];
+}
+d3.svg.diagonal.radial = function() {
+  var diagonal = d3.svg.diagonal(),
+      projection = d3_svg_diagonalProjection,
+      projection_ = diagonal.projection;
+
+  diagonal.projection = function(x) {
+    return arguments.length
+        ? projection_(d3_svg_diagonalRadialProjection(projection = x))
+        : projection;
+  };
+
+  return diagonal;
+};
+
+function d3_svg_diagonalRadialProjection(projection) {
+  return function() {
+    var d = projection.apply(this, arguments),
+        r = d[0],
+        a = d[1] + d3_svg_arcOffset;
+    return [r * Math.cos(a), r * Math.sin(a)];
+  };
+}
+d3.svg.mouse = d3.mouse;
+d3.svg.touches = d3.touches;
+d3.svg.symbol = function() {
+  var type = d3_svg_symbolType,
+      size = d3_svg_symbolSize;
+
+  function symbol(d, i) {
+    return (d3_svg_symbols.get(type.call(this, d, i))
+        || d3_svg_symbolCircle)
+        (size.call(this, d, i));
+  }
+
+  symbol.type = function(x) {
+    if (!arguments.length) return type;
+    type = d3.functor(x);
+    return symbol;
+  };
+
+  // size of symbol in square pixels
+  symbol.size = function(x) {
+    if (!arguments.length) return size;
+    size = d3.functor(x);
+    return symbol;
+  };
+
+  return symbol;
+};
+
+function d3_svg_symbolSize() {
+  return 64;
+}
+
+function d3_svg_symbolType() {
+  return "circle";
+}
+
+function d3_svg_symbolCircle(size) {
+  var r = Math.sqrt(size / Math.PI);
+  return "M0," + r
+      + "A" + r + "," + r + " 0 1,1 0," + (-r)
+      + "A" + r + "," + r + " 0 1,1 0," + r
+      + "Z";
+}
+
+// TODO cross-diagonal?
+var d3_svg_symbols = d3.map({
+  "circle": d3_svg_symbolCircle,
+  "cross": function(size) {
+    var r = Math.sqrt(size / 5) / 2;
+    return "M" + -3 * r + "," + -r
+        + "H" + -r
+        + "V" + -3 * r
+        + "H" + r
+        + "V" + -r
+        + "H" + 3 * r
+        + "V" + r
+        + "H" + r
+        + "V" + 3 * r
+        + "H" + -r
+        + "V" + r
+        + "H" + -3 * r
+        + "Z";
+  },
+  "diamond": function(size) {
+    var ry = Math.sqrt(size / (2 * d3_svg_symbolTan30)),
+        rx = ry * d3_svg_symbolTan30;
+    return "M0," + -ry
+        + "L" + rx + ",0"
+        + " 0," + ry
+        + " " + -rx + ",0"
+        + "Z";
+  },
+  "square": function(size) {
+    var r = Math.sqrt(size) / 2;
+    return "M" + -r + "," + -r
+        + "L" + r + "," + -r
+        + " " + r + "," + r
+        + " " + -r + "," + r
+        + "Z";
+  },
+  "triangle-down": function(size) {
+    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
+        ry = rx * d3_svg_symbolSqrt3 / 2;
+    return "M0," + ry
+        + "L" + rx +"," + -ry
+        + " " + -rx + "," + -ry
+        + "Z";
+  },
+  "triangle-up": function(size) {
+    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
+        ry = rx * d3_svg_symbolSqrt3 / 2;
+    return "M0," + -ry
+        + "L" + rx +"," + ry
+        + " " + -rx + "," + ry
+        + "Z";
+  }
+});
+
+d3.svg.symbolTypes = d3_svg_symbols.keys();
+
+var d3_svg_symbolSqrt3 = Math.sqrt(3),
+    d3_svg_symbolTan30 = Math.tan(30 * Math.PI / 180);
+d3.svg.axis = function() {
+  var scale = d3.scale.linear(),
+      orient = "bottom",
+      tickMajorSize = 6,
+      tickMinorSize = 6,
+      tickEndSize = 6,
+      tickPadding = 3,
+      tickArguments_ = [10],
+      tickValues = null,
+      tickFormat_,
+      tickSubdivide = 0;
+
+  function axis(g) {
+    g.each(function() {
+      var g = d3.select(this);
+
+      // Ticks, or domain values for ordinal scales.
+      var ticks = tickValues == null ? (scale.ticks ? scale.ticks.apply(scale, tickArguments_) : scale.domain()) : tickValues,
+          tickFormat = tickFormat_ == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments_) : String) : tickFormat_;
+
+      // Minor ticks.
+      var subticks = d3_svg_axisSubdivide(scale, ticks, tickSubdivide),
+          subtick = g.selectAll(".minor").data(subticks, String),
+          subtickEnter = subtick.enter().insert("line", "g").attr("class", "tick minor").style("opacity", 1e-6),
+          subtickExit = d3.transition(subtick.exit()).style("opacity", 1e-6).remove(),
+          subtickUpdate = d3.transition(subtick).style("opacity", 1);
+
+      // Major ticks.
+      var tick = g.selectAll("g").data(ticks, String),
+          tickEnter = tick.enter().insert("g", "path").style("opacity", 1e-6),
+          tickExit = d3.transition(tick.exit()).style("opacity", 1e-6).remove(),
+          tickUpdate = d3.transition(tick).style("opacity", 1),
+          tickTransform;
+
+      // Domain.
+      var range = d3_scaleRange(scale),
+          path = g.selectAll(".domain").data([0]),
+          pathEnter = path.enter().append("path").attr("class", "domain"),
+          pathUpdate = d3.transition(path);
+
+      // Stash a snapshot of the new scale, and retrieve the old snapshot.
+      var scale1 = scale.copy(),
+          scale0 = this.__chart__ || scale1;
+      this.__chart__ = scale1;
+
+      tickEnter.append("line").attr("class", "tick");
+      tickEnter.append("text");
+      tickUpdate.select("text").text(tickFormat);
+
+      switch (orient) {
+        case "bottom": {
+          tickTransform = d3_svg_axisX;
+          subtickEnter.attr("y2", tickMinorSize);
+          subtickUpdate.attr("x2", 0).attr("y2", tickMinorSize);
+          tickEnter.select("line").attr("y2", tickMajorSize);
+          tickEnter.select("text").attr("y", Math.max(tickMajorSize, 0) + tickPadding);
+          tickUpdate.select("line").attr("x2", 0).attr("y2", tickMajorSize);
+          tickUpdate.select("text").attr("x", 0).attr("y", Math.max(tickMajorSize, 0) + tickPadding).attr("dy", ".71em").attr("text-anchor", "middle");
+          pathUpdate.attr("d", "M" + range[0] + "," + tickEndSize + "V0H" + range[1] + "V" + tickEndSize);
+          break;
+        }
+        case "top": {
+          tickTransform = d3_svg_axisX;
+          subtickEnter.attr("y2", -tickMinorSize);
+          subtickUpdate.attr("x2", 0).attr("y2", -tickMinorSize);
+          tickEnter.select("line").attr("y2", -tickMajorSize);
+          tickEnter.select("text").attr("y", -(Math.max(tickMajorSize, 0) + tickPadding));
+          tickUpdate.select("line").attr("x2", 0).attr("y2", -tickMajorSize);
+          tickUpdate.select("text").attr("x", 0).attr("y", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("dy", "0em").attr("text-anchor", "middle");
+          pathUpdate.attr("d", "M" + range[0] + "," + -tickEndSize + "V0H" + range[1] + "V" + -tickEndSize);
+          break;
+        }
+        case "left": {
+          tickTransform = d3_svg_axisY;
+          subtickEnter.attr("x2", -tickMinorSize);
+          subtickUpdate.attr("x2", -tickMinorSize).attr("y2", 0);
+          tickEnter.select("line").attr("x2", -tickMajorSize);
+          tickEnter.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding));
+          tickUpdate.select("line").attr("x2", -tickMajorSize).attr("y2", 0);
+          tickUpdate.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "end");
+          pathUpdate.attr("d", "M" + -tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + -tickEndSize);
+          break;
+        }
+        case "right": {
+          tickTransform = d3_svg_axisY;
+          subtickEnter.attr("x2", tickMinorSize);
+          subtickUpdate.attr("x2", tickMinorSize).attr("y2", 0);
+          tickEnter.select("line").attr("x2", tickMajorSize);
+          tickEnter.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding);
+          tickUpdate.select("line").attr("x2", tickMajorSize).attr("y2", 0);
+          tickUpdate.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "start");
+          pathUpdate.attr("d", "M" + tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + tickEndSize);
+          break;
+        }
+      }
+
+      // For quantitative scales:
+      // - enter new ticks from the old scale
+      // - exit old ticks to the new scale
+      if (scale.ticks) {
+        tickEnter.call(tickTransform, scale0);
+        tickUpdate.call(tickTransform, scale1);
+        tickExit.call(tickTransform, scale1);
+        subtickEnter.call(tickTransform, scale0);
+        subtickUpdate.call(tickTransform, scale1);
+        subtickExit.call(tickTransform, scale1);
+      }
+
+      // For ordinal scales:
+      // - any entering ticks are undefined in the old scale
+      // - any exiting ticks are undefined in the new scale
+      // Therefore, we only need to transition updating ticks.
+      else {
+        var dx = scale1.rangeBand() / 2, x = function(d) { return scale1(d) + dx; };
+        tickEnter.call(tickTransform, x);
+        tickUpdate.call(tickTransform, x);
+      }
+    });
+  }
+
+  axis.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = x;
+    return axis;
+  };
+
+  axis.orient = function(x) {
+    if (!arguments.length) return orient;
+    orient = x;
+    return axis;
+  };
+
+  axis.ticks = function() {
+    if (!arguments.length) return tickArguments_;
+    tickArguments_ = arguments;
+    return axis;
+  };
+
+  axis.tickValues = function(x) {
+    if (!arguments.length) return tickValues;
+    tickValues = x;
+    return axis;
+  };
+
+  axis.tickFormat = function(x) {
+    if (!arguments.length) return tickFormat_;
+    tickFormat_ = x;
+    return axis;
+  };
+
+  axis.tickSize = function(x, y, z) {
+    if (!arguments.length) return tickMajorSize;
+    var n = arguments.length - 1;
+    tickMajorSize = +x;
+    tickMinorSize = n > 1 ? +y : tickMajorSize;
+    tickEndSize = n > 0 ? +arguments[n] : tickMajorSize;
+    return axis;
+  };
+
+  axis.tickPadding = function(x) {
+    if (!arguments.length) return tickPadding;
+    tickPadding = +x;
+    return axis;
+  };
+
+  axis.tickSubdivide = function(x) {
+    if (!arguments.length) return tickSubdivide;
+    tickSubdivide = +x;
+    return axis;
+  };
+
+  return axis;
+};
+
+function d3_svg_axisX(selection, x) {
+  selection.attr("transform", function(d) { return "translate(" + x(d) + ",0)"; });
+}
+
+function d3_svg_axisY(selection, y) {
+  selection.attr("transform", function(d) { return "translate(0," + y(d) + ")"; });
+}
+
+function d3_svg_axisSubdivide(scale, ticks, m) {
+  subticks = [];
+  if (m && ticks.length > 1) {
+    var extent = d3_scaleExtent(scale.domain()),
+        subticks,
+        i = -1,
+        n = ticks.length,
+        d = (ticks[1] - ticks[0]) / ++m,
+        j,
+        v;
+    while (++i < n) {
+      for (j = m; --j > 0;) {
+        if ((v = +ticks[i] - j * d) >= extent[0]) {
+          subticks.push(v);
+        }
+      }
+    }
+    for (--i, j = 0; ++j < m && (v = +ticks[i] + j * d) < extent[1];) {
+      subticks.push(v);
+    }
+  }
+  return subticks;
+}
+d3.svg.brush = function() {
+  var event = d3_eventDispatch(brush, "brushstart", "brush", "brushend"),
+      x = null, // x-scale, optional
+      y = null, // y-scale, optional
+      resizes = d3_svg_brushResizes[0],
+      extent = [[0, 0], [0, 0]], // [x0, y0], [x1, y1], in pixels (integers)
+      extentDomain; // the extent in data space, lazily created
+
+  function brush(g) {
+    g.each(function() {
+      var g = d3.select(this),
+          bg = g.selectAll(".background").data([0]),
+          fg = g.selectAll(".extent").data([0]),
+          tz = g.selectAll(".resize").data(resizes, String),
+          e;
+
+      // Prepare the brush container for events.
+      g
+          .style("pointer-events", "all")
+          .on("mousedown.brush", brushstart)
+          .on("touchstart.brush", brushstart);
+
+      // An invisible, mouseable area for starting a new brush.
+      bg.enter().append("rect")
+          .attr("class", "background")
+          .style("visibility", "hidden")
+          .style("cursor", "crosshair");
+
+      // The visible brush extent; style this as you like!
+      fg.enter().append("rect")
+          .attr("class", "extent")
+          .style("cursor", "move");
+
+      // More invisible rects for resizing the extent.
+      tz.enter().append("g")
+          .attr("class", function(d) { return "resize " + d; })
+          .style("cursor", function(d) { return d3_svg_brushCursor[d]; })
+        .append("rect")
+          .attr("x", function(d) { return /[ew]$/.test(d) ? -3 : null; })
+          .attr("y", function(d) { return /^[ns]/.test(d) ? -3 : null; })
+          .attr("width", 6)
+          .attr("height", 6)
+          .style("visibility", "hidden");
+
+      // Show or hide the resizers.
+      tz.style("display", brush.empty() ? "none" : null);
+
+      // Remove any superfluous resizers.
+      tz.exit().remove();
+
+      // Initialize the background to fill the defined range.
+      // If the range isn't defined, you can post-process.
+      if (x) {
+        e = d3_scaleRange(x);
+        bg.attr("x", e[0]).attr("width", e[1] - e[0]);
+        redrawX(g);
+      }
+      if (y) {
+        e = d3_scaleRange(y);
+        bg.attr("y", e[0]).attr("height", e[1] - e[0]);
+        redrawY(g);
+      }
+      redraw(g);
+    });
+  }
+
+  function redraw(g) {
+    g.selectAll(".resize").attr("transform", function(d) {
+      return "translate(" + extent[+/e$/.test(d)][0] + "," + extent[+/^s/.test(d)][1] + ")";
+    });
+  }
+
+  function redrawX(g) {
+    g.select(".extent").attr("x", extent[0][0]);
+    g.selectAll(".extent,.n>rect,.s>rect").attr("width", extent[1][0] - extent[0][0]);
+  }
+
+  function redrawY(g) {
+    g.select(".extent").attr("y", extent[0][1]);
+    g.selectAll(".extent,.e>rect,.w>rect").attr("height", extent[1][1] - extent[0][1]);
+  }
+
+  function brushstart() {
+    var target = this,
+        eventTarget = d3.select(d3.event.target),
+        event_ = event.of(target, arguments),
+        g = d3.select(target),
+        resizing = eventTarget.datum(),
+        resizingX = !/^(n|s)$/.test(resizing) && x,
+        resizingY = !/^(e|w)$/.test(resizing) && y,
+        dragging = eventTarget.classed("extent"),
+        center,
+        origin = mouse(),
+        offset;
+
+    var w = d3.select(window)
+        .on("mousemove.brush", brushmove)
+        .on("mouseup.brush", brushend)
+        .on("touchmove.brush", brushmove)
+        .on("touchend.brush", brushend)
+        .on("keydown.brush", keydown)
+        .on("keyup.brush", keyup);
+
+    // If the extent was clicked on, drag rather than brush;
+    // store the point between the mouse and extent origin instead.
+    if (dragging) {
+      origin[0] = extent[0][0] - origin[0];
+      origin[1] = extent[0][1] - origin[1];
+    }
+
+    // If a resizer was clicked on, record which side is to be resized.
+    // Also, set the origin to the opposite side.
+    else if (resizing) {
+      var ex = +/w$/.test(resizing),
+          ey = +/^n/.test(resizing);
+      offset = [extent[1 - ex][0] - origin[0], extent[1 - ey][1] - origin[1]];
+      origin[0] = extent[ex][0];
+      origin[1] = extent[ey][1];
+    }
+
+    // If the ALT key is down when starting a brush, the center is at the mouse.
+    else if (d3.event.altKey) center = origin.slice();
+
+    // Propagate the active cursor to the body for the drag duration.
+    g.style("pointer-events", "none").selectAll(".resize").style("display", null);
+    d3.select("body").style("cursor", eventTarget.style("cursor"));
+
+    // Notify listeners.
+    event_({type: "brushstart"});
+    brushmove();
+    d3_eventCancel();
+
+    function mouse() {
+      var touches = d3.event.changedTouches;
+      return touches ? d3.touches(target, touches)[0] : d3.mouse(target);
+    }
+
+    function keydown() {
+      if (d3.event.keyCode == 32) {
+        if (!dragging) {
+          center = null;
+          origin[0] -= extent[1][0];
+          origin[1] -= extent[1][1];
+          dragging = 2;
+        }
+        d3_eventCancel();
+      }
+    }
+
+    function keyup() {
+      if (d3.event.keyCode == 32 && dragging == 2) {
+        origin[0] += extent[1][0];
+        origin[1] += extent[1][1];
+        dragging = 0;
+        d3_eventCancel();
+      }
+    }
+
+    function brushmove() {
+      var point = mouse(),
+          moved = false;
+
+      // Preserve the offset for thick resizers.
+      if (offset) {
+        point[0] += offset[0];
+        point[1] += offset[1];
+      }
+
+      if (!dragging) {
+
+        // If needed, determine the center from the current extent.
+        if (d3.event.altKey) {
+          if (!center) center = [(extent[0][0] + extent[1][0]) / 2, (extent[0][1] + extent[1][1]) / 2];
+
+          // Update the origin, for when the ALT key is released.
+          origin[0] = extent[+(point[0] < center[0])][0];
+          origin[1] = extent[+(point[1] < center[1])][1];
+        }
+
+        // When the ALT key is released, we clear the center.
+        else center = null;
+      }
+
+      // Update the brush extent for each dimension.
+      if (resizingX && move1(point, x, 0)) {
+        redrawX(g);
+        moved = true;
+      }
+      if (resizingY && move1(point, y, 1)) {
+        redrawY(g);
+        moved = true;
+      }
+
+      // Final redraw and notify listeners.
+      if (moved) {
+        redraw(g);
+        event_({type: "brush", mode: dragging ? "move" : "resize"});
+      }
+    }
+
+    function move1(point, scale, i) {
+      var range = d3_scaleRange(scale),
+          r0 = range[0],
+          r1 = range[1],
+          position = origin[i],
+          size = extent[1][i] - extent[0][i],
+          min,
+          max;
+
+      // When dragging, reduce the range by the extent size and position.
+      if (dragging) {
+        r0 -= position;
+        r1 -= size + position;
+      }
+
+      // Clamp the point so that the extent fits within the range extent.
+      min = Math.max(r0, Math.min(r1, point[i]));
+
+      // Compute the new extent bounds.
+      if (dragging) {
+        max = (min += position) + size;
+      } else {
+
+        // If the ALT key is pressed, then preserve the center of the extent.
+        if (center) position = Math.max(r0, Math.min(r1, 2 * center[i] - min));
+
+        // Compute the min and max of the position and point.
+        if (position < min) {
+          max = min;
+          min = position;
+        } else {
+          max = position;
+        }
+      }
+
+      // Update the stored bounds.
+      if (extent[0][i] !== min || extent[1][i] !== max) {
+        extentDomain = null;
+        extent[0][i] = min;
+        extent[1][i] = max;
+        return true;
+      }
+    }
+
+    function brushend() {
+      brushmove();
+
+      // reset the cursor styles
+      g.style("pointer-events", "all").selectAll(".resize").style("display", brush.empty() ? "none" : null);
+      d3.select("body").style("cursor", null);
+
+      w .on("mousemove.brush", null)
+        .on("mouseup.brush", null)
+        .on("touchmove.brush", null)
+        .on("touchend.brush", null)
+        .on("keydown.brush", null)
+        .on("keyup.brush", null);
+
+      event_({type: "brushend"});
+      d3_eventCancel();
+    }
+  }
+
+  brush.x = function(z) {
+    if (!arguments.length) return x;
+    x = z;
+    resizes = d3_svg_brushResizes[!x << 1 | !y]; // fore!
+    return brush;
+  };
+
+  brush.y = function(z) {
+    if (!arguments.length) return y;
+    y = z;
+    resizes = d3_svg_brushResizes[!x << 1 | !y]; // fore!
+    return brush;
+  };
+
+  brush.extent = function(z) {
+    var x0, x1, y0, y1, t;
+
+    // Invert the pixel extent to data-space.
+    if (!arguments.length) {
+      z = extentDomain || extent;
+      if (x) {
+        x0 = z[0][0], x1 = z[1][0];
+        if (!extentDomain) {
+          x0 = extent[0][0], x1 = extent[1][0];
+          if (x.invert) x0 = x.invert(x0), x1 = x.invert(x1);
+          if (x1 < x0) t = x0, x0 = x1, x1 = t;
+        }
+      }
+      if (y) {
+        y0 = z[0][1], y1 = z[1][1];
+        if (!extentDomain) {
+          y0 = extent[0][1], y1 = extent[1][1];
+          if (y.invert) y0 = y.invert(y0), y1 = y.invert(y1);
+          if (y1 < y0) t = y0, y0 = y1, y1 = t;
+        }
+      }
+      return x && y ? [[x0, y0], [x1, y1]] : x ? [x0, x1] : y && [y0, y1];
+    }
+
+    // Scale the data-space extent to pixels.
+    extentDomain = [[0, 0], [0, 0]];
+    if (x) {
+      x0 = z[0], x1 = z[1];
+      if (y) x0 = x0[0], x1 = x1[0];
+      extentDomain[0][0] = x0, extentDomain[1][0] = x1;
+      if (x.invert) x0 = x(x0), x1 = x(x1);
+      if (x1 < x0) t = x0, x0 = x1, x1 = t;
+      extent[0][0] = x0 | 0, extent[1][0] = x1 | 0;
+    }
+    if (y) {
+      y0 = z[0], y1 = z[1];
+      if (x) y0 = y0[1], y1 = y1[1];
+      extentDomain[0][1] = y0, extentDomain[1][1] = y1;
+      if (y.invert) y0 = y(y0), y1 = y(y1);
+      if (y1 < y0) t = y0, y0 = y1, y1 = t;
+      extent[0][1] = y0 | 0, extent[1][1] = y1 | 0;
+    }
+
+    return brush;
+  };
+
+  brush.clear = function() {
+    extentDomain = null;
+    extent[0][0] =
+    extent[0][1] =
+    extent[1][0] =
+    extent[1][1] = 0;
+    return brush;
+  };
+
+  brush.empty = function() {
+    return (x && extent[0][0] === extent[1][0])
+        || (y && extent[0][1] === extent[1][1]);
+  };
+
+  return d3.rebind(brush, event, "on");
+};
+
+var d3_svg_brushCursor = {
+  n: "ns-resize",
+  e: "ew-resize",
+  s: "ns-resize",
+  w: "ew-resize",
+  nw: "nwse-resize",
+  ne: "nesw-resize",
+  se: "nwse-resize",
+  sw: "nesw-resize"
+};
+
+var d3_svg_brushResizes = [
+  ["n", "e", "s", "w", "nw", "ne", "se", "sw"],
+  ["e", "w"],
+  ["n", "s"],
+  []
+];
+d3.behavior = {};
+// TODO Track touch points by identifier.
+
+d3.behavior.drag = function() {
+  var event = d3_eventDispatch(drag, "drag", "dragstart", "dragend"),
+      origin = null;
+
+  function drag() {
+    this.on("mousedown.drag", mousedown)
+        .on("touchstart.drag", mousedown);
+  }
+
+  function mousedown() {
+    var target = this,
+        event_ = event.of(target, arguments),
+        eventTarget = d3.event.target,
+        offset,
+        origin_ = point(),
+        moved = 0;
+
+    var w = d3.select(window)
+        .on("mousemove.drag", dragmove)
+        .on("touchmove.drag", dragmove)
+        .on("mouseup.drag", dragend, true)
+        .on("touchend.drag", dragend, true);
+
+    if (origin) {
+      offset = origin.apply(target, arguments);
+      offset = [offset.x - origin_[0], offset.y - origin_[1]];
+    } else {
+      offset = [0, 0];
+    }
+
+    event_({type: "dragstart"});
+
+    function point() {
+      var p = target.parentNode,
+          t = d3.event.changedTouches;
+      return t ? d3.touches(p, t)[0] : d3.mouse(p);
+    }
+
+    function dragmove() {
+      if (!target.parentNode) return dragend(); // target removed from DOM
+
+      var p = point(),
+          dx = p[0] - origin_[0],
+          dy = p[1] - origin_[1];
+
+      moved |= dx | dy;
+      origin_ = p;
+      d3_eventCancel();
+
+      event_({type: "drag", x: p[0] + offset[0], y: p[1] + offset[1], dx: dx, dy: dy});
+    }
+
+    function dragend() {
+      event_({type: "dragend"});
+
+      // if moved, prevent the mouseup (and possibly click) from propagating
+      if (moved) {
+        d3_eventCancel();
+        if (d3.event.target === eventTarget) w.on("click.drag", click, true);
+      }
+
+      w .on("mousemove.drag", null)
+        .on("touchmove.drag", null)
+        .on("mouseup.drag", null)
+        .on("touchend.drag", null);
+    }
+
+    // prevent the subsequent click from propagating (e.g., for anchors)
+    function click() {
+      d3_eventCancel();
+      w.on("click.drag", null);
+    }
+  }
+
+  drag.origin = function(x) {
+    if (!arguments.length) return origin;
+    origin = x;
+    return drag;
+  };
+
+  return d3.rebind(drag, event, "on");
+};
+d3.behavior.zoom = function() {
+  var translate = [0, 0],
+      translate0, // translate when we started zooming (to avoid drift)
+      scale = 1,
+      scale0, // scale when we started touching
+      scaleExtent = d3_behavior_zoomInfinity,
+      event = d3_eventDispatch(zoom, "zoom"),
+      x0,
+      x1,
+      y0,
+      y1,
+      touchtime; // time of last touchstart (to detect double-tap)
+
+  function zoom() {
+    this
+        .on("mousedown.zoom", mousedown)
+        .on("mousewheel.zoom", mousewheel)
+        .on("mousemove.zoom", mousemove)
+        .on("DOMMouseScroll.zoom", mousewheel)
+        .on("dblclick.zoom", dblclick)
+        .on("touchstart.zoom", touchstart)
+        .on("touchmove.zoom", touchmove)
+        .on("touchend.zoom", touchstart);
+  }
+
+  zoom.translate = function(x) {
+    if (!arguments.length) return translate;
+    translate = x.map(Number);
+    return zoom;
+  };
+
+  zoom.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = +x;
+    return zoom;
+  };
+
+  zoom.scaleExtent = function(x) {
+    if (!arguments.length) return scaleExtent;
+    scaleExtent = x == null ? d3_behavior_zoomInfinity : x.map(Number);
+    return zoom;
+  };
+
+  zoom.x = function(z) {
+    if (!arguments.length) return x1;
+    x1 = z;
+    x0 = z.copy();
+    return zoom;
+  };
+
+  zoom.y = function(z) {
+    if (!arguments.length) return y1;
+    y1 = z;
+    y0 = z.copy();
+    return zoom;
+  };
+
+  function location(p) {
+    return [(p[0] - translate[0]) / scale, (p[1] - translate[1]) / scale];
+  }
+
+  function point(l) {
+    return [l[0] * scale + translate[0], l[1] * scale + translate[1]];
+  }
+
+  function scaleTo(s) {
+    scale = Math.max(scaleExtent[0], Math.min(scaleExtent[1], s));
+  }
+
+  function translateTo(p, l) {
+    l = point(l);
+    translate[0] += p[0] - l[0];
+    translate[1] += p[1] - l[1];
+  }
+
+  function dispatch(event) {
+    if (x1) x1.domain(x0.range().map(function(x) { return (x - translate[0]) / scale; }).map(x0.invert));
+    if (y1) y1.domain(y0.range().map(function(y) { return (y - translate[1]) / scale; }).map(y0.invert));
+    d3.event.preventDefault();
+    event({type: "zoom", scale: scale, translate: translate});
+  }
+
+  function mousedown() {
+    var target = this,
+        event_ = event.of(target, arguments),
+        eventTarget = d3.event.target,
+        moved = 0,
+        w = d3.select(window).on("mousemove.zoom", mousemove).on("mouseup.zoom", mouseup),
+        l = location(d3.mouse(target));
+
+    window.focus();
+    d3_eventCancel();
+
+    function mousemove() {
+      moved = 1;
+      translateTo(d3.mouse(target), l);
+      dispatch(event_);
+    }
+
+    function mouseup() {
+      if (moved) d3_eventCancel();
+      w.on("mousemove.zoom", null).on("mouseup.zoom", null);
+      if (moved && d3.event.target === eventTarget) w.on("click.zoom", click);
+    }
+
+    function click() {
+      d3_eventCancel();
+      w.on("click.zoom", null);
+    }
+  }
+
+  function mousewheel() {
+    if (!translate0) translate0 = location(d3.mouse(this));
+    scaleTo(Math.pow(2, d3_behavior_zoomDelta() * .002) * scale);
+    translateTo(d3.mouse(this), translate0);
+    dispatch(event.of(this, arguments));
+  }
+
+  function mousemove() {
+    translate0 = null;
+  }
+
+  function dblclick() {
+    var p = d3.mouse(this), l = location(p);
+    scaleTo(d3.event.shiftKey ? scale / 2 : scale * 2);
+    translateTo(p, l);
+    dispatch(event.of(this, arguments));
+  }
+
+  function touchstart() {
+    var touches = d3.touches(this),
+        now = Date.now();
+
+    scale0 = scale;
+    translate0 = {};
+    touches.forEach(function(t) { translate0[t.identifier] = location(t); });
+    d3_eventCancel();
+
+    if ((touches.length === 1) && (now - touchtime < 500)) { // dbltap
+      var p = touches[0], l = location(touches[0]);
+      scaleTo(scale * 2);
+      translateTo(p, l);
+      dispatch(event.of(this, arguments));
+    }
+    touchtime = now;
+  }
+
+  function touchmove() {
+    var touches = d3.touches(this),
+        p0 = touches[0],
+        l0 = translate0[p0.identifier];
+    if (p1 = touches[1]) {
+      var p1, l1 = translate0[p1.identifier];
+      p0 = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
+      l0 = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
+      scaleTo(d3.event.scale * scale0);
+    }
+    translateTo(p0, l0);
+    dispatch(event.of(this, arguments));
+  }
+
+  return d3.rebind(zoom, event, "on");
+};
+
+var d3_behavior_zoomDiv, // for interpreting mousewheel events
+    d3_behavior_zoomInfinity = [0, Infinity]; // default scale extent
+
+function d3_behavior_zoomDelta() {
+
+  // mousewheel events are totally broken!
+  // https://bugs.webkit.org/show_bug.cgi?id=40441
+  // not only that, but Chrome and Safari differ in re. to acceleration!
+  if (!d3_behavior_zoomDiv) {
+    d3_behavior_zoomDiv = d3.select("body").append("div")
+        .style("visibility", "hidden")
+        .style("top", 0)
+        .style("height", 0)
+        .style("width", 0)
+        .style("overflow-y", "scroll")
+      .append("div")
+        .style("height", "2000px")
+      .node().parentNode;
+  }
+
+  var e = d3.event, delta;
+  try {
+    d3_behavior_zoomDiv.scrollTop = 1000;
+    d3_behavior_zoomDiv.dispatchEvent(e);
+    delta = 1000 - d3_behavior_zoomDiv.scrollTop;
+  } catch (error) {
+    delta = e.wheelDelta || (-e.detail * 5);
+  }
+
+  return delta;
+}
+d3.layout = {};
+// Implements hierarchical edge bundling using Holten's algorithm. For each
+// input link, a path is computed that travels through the tree, up the parent
+// hierarchy to the least common ancestor, and then back down to the destination
+// node. Each path is simply an array of nodes.
+d3.layout.bundle = function() {
+  return function(links) {
+    var paths = [],
+        i = -1,
+        n = links.length;
+    while (++i < n) paths.push(d3_layout_bundlePath(links[i]));
+    return paths;
+  };
+};
+
+function d3_layout_bundlePath(link) {
+  var start = link.source,
+      end = link.target,
+      lca = d3_layout_bundleLeastCommonAncestor(start, end),
+      points = [start];
+  while (start !== lca) {
+    start = start.parent;
+    points.push(start);
+  }
+  var k = points.length;
+  while (end !== lca) {
+    points.splice(k, 0, end);
+    end = end.parent;
+  }
+  return points;
+}
+
+function d3_layout_bundleAncestors(node) {
+  var ancestors = [],
+      parent = node.parent;
+  while (parent != null) {
+    ancestors.push(node);
+    node = parent;
+    parent = parent.parent;
+  }
+  ancestors.push(node);
+  return ancestors;
+}
+
+function d3_layout_bundleLeastCommonAncestor(a, b) {
+  if (a === b) return a;
+  var aNodes = d3_layout_bundleAncestors(a),
+      bNodes = d3_layout_bundleAncestors(b),
+      aNode = aNodes.pop(),
+      bNode = bNodes.pop(),
+      sharedNode = null;
+  while (aNode === bNode) {
+    sharedNode = aNode;
+    aNode = aNodes.pop();
+    bNode = bNodes.pop();
+  }
+  return sharedNode;
+}
+d3.layout.chord = function() {
+  var chord = {},
+      chords,
+      groups,
+      matrix,
+      n,
+      padding = 0,
+      sortGroups,
+      sortSubgroups,
+      sortChords;
+
+  function relayout() {
+    var subgroups = {},
+        groupSums = [],
+        groupIndex = d3.range(n),
+        subgroupIndex = [],
+        k,
+        x,
+        x0,
+        i,
+        j;
+
+    chords = [];
+    groups = [];
+
+    // Compute the sum.
+    k = 0, i = -1; while (++i < n) {
+      x = 0, j = -1; while (++j < n) {
+        x += matrix[i][j];
+      }
+      groupSums.push(x);
+      subgroupIndex.push(d3.range(n));
+      k += x;
+    }
+
+    // Sort groups…
+    if (sortGroups) {
+      groupIndex.sort(function(a, b) {
+        return sortGroups(groupSums[a], groupSums[b]);
+      });
+    }
+
+    // Sort subgroups…
+    if (sortSubgroups) {
+      subgroupIndex.forEach(function(d, i) {
+        d.sort(function(a, b) {
+          return sortSubgroups(matrix[i][a], matrix[i][b]);
+        });
+      });
+    }
+
+    // Convert the sum to scaling factor for [0, 2pi].
+    // TODO Allow start and end angle to be specified.
+    // TODO Allow padding to be specified as percentage?
+    k = (2 * Math.PI - padding * n) / k;
+
+    // Compute the start and end angle for each group and subgroup.
+    // Note: Opera has a bug reordering object literal properties!
+    x = 0, i = -1; while (++i < n) {
+      x0 = x, j = -1; while (++j < n) {
+        var di = groupIndex[i],
+            dj = subgroupIndex[di][j],
+            v = matrix[di][dj],
+            a0 = x,
+            a1 = x += v * k;
+        subgroups[di + "-" + dj] = {
+          index: di,
+          subindex: dj,
+          startAngle: a0,
+          endAngle: a1,
+          value: v
+        };
+      }
+      groups.push({
+        index: di,
+        startAngle: x0,
+        endAngle: x,
+        value: (x - x0) / k
+      });
+      x += padding;
+    }
+
+    // Generate chords for each (non-empty) subgroup-subgroup link.
+    i = -1; while (++i < n) {
+      j = i - 1; while (++j < n) {
+        var source = subgroups[i + "-" + j],
+            target = subgroups[j + "-" + i];
+        if (source.value || target.value) {
+          chords.push(source.value < target.value
+              ? {source: target, target: source}
+              : {source: source, target: target});
+        }
+      }
+    }
+
+    if (sortChords) resort();
+  }
+
+  function resort() {
+    chords.sort(function(a, b) {
+      return sortChords(
+          (a.source.value + a.target.value) / 2,
+          (b.source.value + b.target.value) / 2);
+    });
+  }
+
+  chord.matrix = function(x) {
+    if (!arguments.length) return matrix;
+    n = (matrix = x) && matrix.length;
+    chords = groups = null;
+    return chord;
+  };
+
+  chord.padding = function(x) {
+    if (!arguments.length) return padding;
+    padding = x;
+    chords = groups = null;
+    return chord;
+  };
+
+  chord.sortGroups = function(x) {
+    if (!arguments.length) return sortGroups;
+    sortGroups = x;
+    chords = groups = null;
+    return chord;
+  };
+
+  chord.sortSubgroups = function(x) {
+    if (!arguments.length) return sortSubgroups;
+    sortSubgroups = x;
+    chords = null;
+    return chord;
+  };
+
+  chord.sortChords = function(x) {
+    if (!arguments.length) return sortChords;
+    sortChords = x;
+    if (chords) resort();
+    return chord;
+  };
+
+  chord.chords = function() {
+    if (!chords) relayout();
+    return chords;
+  };
+
+  chord.groups = function() {
+    if (!groups) relayout();
+    return groups;
+  };
+
+  return chord;
+};
+// A rudimentary force layout using Gauss-Seidel.
+d3.layout.force = function() {
+  var force = {},
+      event = d3.dispatch("start", "tick", "end"),
+      size = [1, 1],
+      drag,
+      alpha,
+      friction = .9,
+      linkDistance = d3_layout_forceLinkDistance,
+      linkStrength = d3_layout_forceLinkStrength,
+      charge = -30,
+      gravity = .1,
+      theta = .8,
+      interval,
+      nodes = [],
+      links = [],
+      distances,
+      strengths,
+      charges;
+
+  function repulse(node) {
+    return function(quad, x1, y1, x2, y2) {
+      if (quad.point !== node) {
+        var dx = quad.cx - node.x,
+            dy = quad.cy - node.y,
+            dn = 1 / Math.sqrt(dx * dx + dy * dy);
+
+        /* Barnes-Hut criterion. */
+        if ((x2 - x1) * dn < theta) {
+          var k = quad.charge * dn * dn;
+          node.px -= dx * k;
+          node.py -= dy * k;
+          return true;
+        }
+
+        if (quad.point && isFinite(dn)) {
+          var k = quad.pointCharge * dn * dn;
+          node.px -= dx * k;
+          node.py -= dy * k;
+        }
+      }
+      return !quad.charge;
+    };
+  }
+
+  force.tick = function() {
+    // simulated annealing, basically
+    if ((alpha *= .99) < .005) {
+      event.end({type: "end", alpha: alpha = 0});
+      return true;
+    }
+
+    var n = nodes.length,
+        m = links.length,
+        q,
+        i, // current index
+        o, // current object
+        s, // current source
+        t, // current target
+        l, // current distance
+        k, // current force
+        x, // x-distance
+        y; // y-distance
+
+    // gauss-seidel relaxation for links
+    for (i = 0; i < m; ++i) {
+      o = links[i];
+      s = o.source;
+      t = o.target;
+      x = t.x - s.x;
+      y = t.y - s.y;
+      if (l = (x * x + y * y)) {
+        l = alpha * strengths[i] * ((l = Math.sqrt(l)) - distances[i]) / l;
+        x *= l;
+        y *= l;
+        t.x -= x * (k = s.weight / (t.weight + s.weight));
+        t.y -= y * k;
+        s.x += x * (k = 1 - k);
+        s.y += y * k;
+      }
+    }
+
+    // apply gravity forces
+    if (k = alpha * gravity) {
+      x = size[0] / 2;
+      y = size[1] / 2;
+      i = -1; if (k) while (++i < n) {
+        o = nodes[i];
+        o.x += (x - o.x) * k;
+        o.y += (y - o.y) * k;
+      }
+    }
+
+    // compute quadtree center of mass and apply charge forces
+    if (charge) {
+      d3_layout_forceAccumulate(q = d3.geom.quadtree(nodes), alpha, charges);
+      i = -1; while (++i < n) {
+        if (!(o = nodes[i]).fixed) {
+          q.visit(repulse(o));
+        }
+      }
+    }
+
+    // position verlet integration
+    i = -1; while (++i < n) {
+      o = nodes[i];
+      if (o.fixed) {
+        o.x = o.px;
+        o.y = o.py;
+      } else {
+        o.x -= (o.px - (o.px = o.x)) * friction;
+        o.y -= (o.py - (o.py = o.y)) * friction;
+      }
+    }
+
+    event.tick({type: "tick", alpha: alpha});
+  };
+
+  force.nodes = function(x) {
+    if (!arguments.length) return nodes;
+    nodes = x;
+    return force;
+  };
+
+  force.links = function(x) {
+    if (!arguments.length) return links;
+    links = x;
+    return force;
+  };
+
+  force.size = function(x) {
+    if (!arguments.length) return size;
+    size = x;
+    return force;
+  };
+
+  force.linkDistance = function(x) {
+    if (!arguments.length) return linkDistance;
+    linkDistance = d3.functor(x);
+    return force;
+  };
+
+  // For backwards-compatibility.
+  force.distance = force.linkDistance;
+
+  force.linkStrength = function(x) {
+    if (!arguments.length) return linkStrength;
+    linkStrength = d3.functor(x);
+    return force;
+  };
+
+  force.friction = function(x) {
+    if (!arguments.length) return friction;
+    friction = x;
+    return force;
+  };
+
+  force.charge = function(x) {
+    if (!arguments.length) return charge;
+    charge = typeof x === "function" ? x : +x;
+    return force;
+  };
+
+  force.gravity = function(x) {
+    if (!arguments.length) return gravity;
+    gravity = x;
+    return force;
+  };
+
+  force.theta = function(x) {
+    if (!arguments.length) return theta;
+    theta = x;
+    return force;
+  };
+
+  force.alpha = function(x) {
+    if (!arguments.length) return alpha;
+
+    if (alpha) { // if we're already running
+      if (x > 0) alpha = x; // we might keep it hot
+      else alpha = 0; // or, next tick will dispatch "end"
+    } else if (x > 0) { // otherwise, fire it up!
+      event.start({type: "start", alpha: alpha = x});
+      d3.timer(force.tick);
+    }
+
+    return force;
+  };
+
+  force.start = function() {
+    var i,
+        j,
+        n = nodes.length,
+        m = links.length,
+        w = size[0],
+        h = size[1],
+        neighbors,
+        o;
+
+    for (i = 0; i < n; ++i) {
+      (o = nodes[i]).index = i;
+      o.weight = 0;
+    }
+
+    distances = [];
+    strengths = [];
+    for (i = 0; i < m; ++i) {
+      o = links[i];
+      if (typeof o.source == "number") o.source = nodes[o.source];
+      if (typeof o.target == "number") o.target = nodes[o.target];
+      distances[i] = linkDistance.call(this, o, i);
+      strengths[i] = linkStrength.call(this, o, i);
+      ++o.source.weight;
+      ++o.target.weight;
+    }
+
+    for (i = 0; i < n; ++i) {
+      o = nodes[i];
+      if (isNaN(o.x)) o.x = position("x", w);
+      if (isNaN(o.y)) o.y = position("y", h);
+      if (isNaN(o.px)) o.px = o.x;
+      if (isNaN(o.py)) o.py = o.y;
+    }
+
+    charges = [];
+    if (typeof charge === "function") {
+      for (i = 0; i < n; ++i) {
+        charges[i] = +charge.call(this, nodes[i], i);
+      }
+    } else {
+      for (i = 0; i < n; ++i) {
+        charges[i] = charge;
+      }
+    }
+
+    // initialize node position based on first neighbor
+    function position(dimension, size) {
+      var neighbors = neighbor(i),
+          j = -1,
+          m = neighbors.length,
+          x;
+      while (++j < m) if (!isNaN(x = neighbors[j][dimension])) return x;
+      return Math.random() * size;
+    }
+
+    // initialize neighbors lazily
+    function neighbor() {
+      if (!neighbors) {
+        neighbors = [];
+        for (j = 0; j < n; ++j) {
+          neighbors[j] = [];
+        }
+        for (j = 0; j < m; ++j) {
+          var o = links[j];
+          neighbors[o.source.index].push(o.target);
+          neighbors[o.target.index].push(o.source);
+        }
+      }
+      return neighbors[i];
+    }
+
+    return force.resume();
+  };
+
+  force.resume = function() {
+    return force.alpha(.1);
+  };
+
+  force.stop = function() {
+    return force.alpha(0);
+  };
+
+  // use `node.call(force.drag)` to make nodes draggable
+  force.drag = function() {
+    if (!drag) drag = d3.behavior.drag()
+        .origin(Object)
+        .on("dragstart", dragstart)
+        .on("drag", d3_layout_forceDrag)
+        .on("dragend", d3_layout_forceDragEnd);
+
+    this.on("mouseover.force", d3_layout_forceDragOver)
+        .on("mouseout.force", d3_layout_forceDragOut)
+        .call(drag);
+  };
+
+  function dragstart(d) {
+    d3_layout_forceDragOver(d3_layout_forceDragNode = d);
+    d3_layout_forceDragForce = force;
+  }
+
+  return d3.rebind(force, event, "on");
+};
+
+var d3_layout_forceDragForce,
+    d3_layout_forceDragNode;
+
+function d3_layout_forceDragOver(d) {
+  d.fixed |= 2;
+}
+
+function d3_layout_forceDragOut(d) {
+  if (d !== d3_layout_forceDragNode) d.fixed &= 1;
+}
+
+function d3_layout_forceDragEnd() {
+  d3_layout_forceDragNode.fixed &= 1;
+  d3_layout_forceDragForce = d3_layout_forceDragNode = null;
+}
+
+function d3_layout_forceDrag() {
+  d3_layout_forceDragNode.px = d3.event.x;
+  d3_layout_forceDragNode.py = d3.event.y;
+  d3_layout_forceDragForce.resume(); // restart annealing
+}
+
+function d3_layout_forceAccumulate(quad, alpha, charges) {
+  var cx = 0,
+      cy = 0;
+  quad.charge = 0;
+  if (!quad.leaf) {
+    var nodes = quad.nodes,
+        n = nodes.length,
+        i = -1,
+        c;
+    while (++i < n) {
+      c = nodes[i];
+      if (c == null) continue;
+      d3_layout_forceAccumulate(c, alpha, charges);
+      quad.charge += c.charge;
+      cx += c.charge * c.cx;
+      cy += c.charge * c.cy;
+    }
+  }
+  if (quad.point) {
+    // jitter internal nodes that are coincident
+    if (!quad.leaf) {
+      quad.point.x += Math.random() - .5;
+      quad.point.y += Math.random() - .5;
+    }
+    var k = alpha * charges[quad.point.index];
+    quad.charge += quad.pointCharge = k;
+    cx += k * quad.point.x;
+    cy += k * quad.point.y;
+  }
+  quad.cx = cx / quad.charge;
+  quad.cy = cy / quad.charge;
+}
+
+function d3_layout_forceLinkDistance(link) {
+  return 20;
+}
+
+function d3_layout_forceLinkStrength(link) {
+  return 1;
+}
+d3.layout.partition = function() {
+  var hierarchy = d3.layout.hierarchy(),
+      size = [1, 1]; // width, height
+
+  function position(node, x, dx, dy) {
+    var children = node.children;
+    node.x = x;
+    node.y = node.depth * dy;
+    node.dx = dx;
+    node.dy = dy;
+    if (children && (n = children.length)) {
+      var i = -1,
+          n,
+          c,
+          d;
+      dx = node.value ? dx / node.value : 0;
+      while (++i < n) {
+        position(c = children[i], x, d = c.value * dx, dy);
+        x += d;
+      }
+    }
+  }
+
+  function depth(node) {
+    var children = node.children,
+        d = 0;
+    if (children && (n = children.length)) {
+      var i = -1,
+          n;
+      while (++i < n) d = Math.max(d, depth(children[i]));
+    }
+    return 1 + d;
+  }
+
+  function partition(d, i) {
+    var nodes = hierarchy.call(this, d, i);
+    position(nodes[0], 0, size[0], size[1] / depth(nodes[0]));
+    return nodes;
+  }
+
+  partition.size = function(x) {
+    if (!arguments.length) return size;
+    size = x;
+    return partition;
+  };
+
+  return d3_layout_hierarchyRebind(partition, hierarchy);
+};
+d3.layout.pie = function() {
+  var value = Number,
+      sort = d3_layout_pieSortByValue,
+      startAngle = 0,
+      endAngle = 2 * Math.PI;
+
+  function pie(data, i) {
+
+    // Compute the numeric values for each data element.
+    var values = data.map(function(d, i) { return +value.call(pie, d, i); });
+
+    // Compute the start angle.
+    var a = +(typeof startAngle === "function"
+        ? startAngle.apply(this, arguments)
+        : startAngle);
+
+    // Compute the angular scale factor: from value to radians.
+    var k = ((typeof endAngle === "function"
+        ? endAngle.apply(this, arguments)
+        : endAngle) - startAngle)
+        / d3.sum(values);
+
+    // Optionally sort the data.
+    var index = d3.range(data.length);
+    if (sort != null) index.sort(sort === d3_layout_pieSortByValue
+        ? function(i, j) { return values[j] - values[i]; }
+        : function(i, j) { return sort(data[i], data[j]); });
+
+    // Compute the arcs!
+    // They are stored in the original data's order.
+    var arcs = [];
+    index.forEach(function(i) {
+      arcs[i] = {
+        data: data[i],
+        value: d = values[i],
+        startAngle: a,
+        endAngle: a += d * k
+      };
+    });
+    return arcs;
+  }
+
+  /**
+   * Specifies the value function *x*, which returns a nonnegative numeric value
+   * for each datum. The default value function is `Number`. The value function
+   * is passed two arguments: the current datum and the current index.
+   */
+  pie.value = function(x) {
+    if (!arguments.length) return value;
+    value = x;
+    return pie;
+  };
+
+  /**
+   * Specifies a sort comparison operator *x*. The comparator is passed two data
+   * elements from the data array, a and b; it returns a negative value if a is
+   * less than b, a positive value if a is greater than b, and zero if a equals
+   * b.
+   */
+  pie.sort = function(x) {
+    if (!arguments.length) return sort;
+    sort = x;
+    return pie;
+  };
+
+  /**
+   * Specifies the overall start angle of the pie chart. Defaults to 0. The
+   * start angle can be specified either as a constant or as a function; in the
+   * case of a function, it is evaluated once per array (as opposed to per
+   * element).
+   */
+  pie.startAngle = function(x) {
+    if (!arguments.length) return startAngle;
+    startAngle = x;
+    return pie;
+  };
+
+  /**
+   * Specifies the overall end angle of the pie chart. Defaults to 2π. The
+   * end angle can be specified either as a constant or as a function; in the
+   * case of a function, it is evaluated once per array (as opposed to per
+   * element).
+   */
+  pie.endAngle = function(x) {
+    if (!arguments.length) return endAngle;
+    endAngle = x;
+    return pie;
+  };
+
+  return pie;
+};
+
+var d3_layout_pieSortByValue = {};
+// data is two-dimensional array of x,y; we populate y0
+d3.layout.stack = function() {
+  var values = Object,
+      order = d3_layout_stackOrderDefault,
+      offset = d3_layout_stackOffsetZero,
+      out = d3_layout_stackOut,
+      x = d3_layout_stackX,
+      y = d3_layout_stackY;
+
+  function stack(data, index) {
+
+    // Convert series to canonical two-dimensional representation.
+    var series = data.map(function(d, i) {
+      return values.call(stack, d, i);
+    });
+
+    // Convert each series to canonical [[x,y]] representation.
+    var points = series.map(function(d, i) {
+      return d.map(function(v, i) {
+        return [x.call(stack, v, i), y.call(stack, v, i)];
+      });
+    });
+
+    // Compute the order of series, and permute them.
+    var orders = order.call(stack, points, index);
+    series = d3.permute(series, orders);
+    points = d3.permute(points, orders);
+
+    // Compute the baseline…
+    var offsets = offset.call(stack, points, index);
+
+    // And propagate it to other series.
+    var n = series.length,
+        m = series[0].length,
+        i,
+        j,
+        o;
+    for (j = 0; j < m; ++j) {
+      out.call(stack, series[0][j], o = offsets[j], points[0][j][1]);
+      for (i = 1; i < n; ++i) {
+        out.call(stack, series[i][j], o += points[i - 1][j][1], points[i][j][1]);
+      }
+    }
+
+    return data;
+  }
+
+  stack.values = function(x) {
+    if (!arguments.length) return values;
+    values = x;
+    return stack;
+  };
+
+  stack.order = function(x) {
+    if (!arguments.length) return order;
+    order = typeof x === "function" ? x : d3_layout_stackOrders.get(x) || d3_layout_stackOrderDefault;
+    return stack;
+  };
+
+  stack.offset = function(x) {
+    if (!arguments.length) return offset;
+    offset = typeof x === "function" ? x : d3_layout_stackOffsets.get(x) || d3_layout_stackOffsetZero;
+    return stack;
+  };
+
+  stack.x = function(z) {
+    if (!arguments.length) return x;
+    x = z;
+    return stack;
+  };
+
+  stack.y = function(z) {
+    if (!arguments.length) return y;
+    y = z;
+    return stack;
+  };
+
+  stack.out = function(z) {
+    if (!arguments.length) return out;
+    out = z;
+    return stack;
+  };
+
+  return stack;
+}
+
+function d3_layout_stackX(d) {
+  return d.x;
+}
+
+function d3_layout_stackY(d) {
+  return d.y;
+}
+
+function d3_layout_stackOut(d, y0, y) {
+  d.y0 = y0;
+  d.y = y;
+}
+
+var d3_layout_stackOrders = d3.map({
+
+  "inside-out": function(data) {
+    var n = data.length,
+        i,
+        j,
+        max = data.map(d3_layout_stackMaxIndex),
+        sums = data.map(d3_layout_stackReduceSum),
+        index = d3.range(n).sort(function(a, b) { return max[a] - max[b]; }),
+        top = 0,
+        bottom = 0,
+        tops = [],
+        bottoms = [];
+    for (i = 0; i < n; ++i) {
+      j = index[i];
+      if (top < bottom) {
+        top += sums[j];
+        tops.push(j);
+      } else {
+        bottom += sums[j];
+        bottoms.push(j);
+      }
+    }
+    return bottoms.reverse().concat(tops);
+  },
+
+  "reverse": function(data) {
+    return d3.range(data.length).reverse();
+  },
+
+  "default": d3_layout_stackOrderDefault
+
+});
+
+var d3_layout_stackOffsets = d3.map({
+
+  "silhouette": function(data) {
+    var n = data.length,
+        m = data[0].length,
+        sums = [],
+        max = 0,
+        i,
+        j,
+        o,
+        y0 = [];
+    for (j = 0; j < m; ++j) {
+      for (i = 0, o = 0; i < n; i++) o += data[i][j][1];
+      if (o > max) max = o;
+      sums.push(o);
+    }
+    for (j = 0; j < m; ++j) {
+      y0[j] = (max - sums[j]) / 2;
+    }
+    return y0;
+  },
+
+  "wiggle": function(data) {
+    var n = data.length,
+        x = data[0],
+        m = x.length,
+        max = 0,
+        i,
+        j,
+        k,
+        s1,
+        s2,
+        s3,
+        dx,
+        o,
+        o0,
+        y0 = [];
+    y0[0] = o = o0 = 0;
+    for (j = 1; j < m; ++j) {
+      for (i = 0, s1 = 0; i < n; ++i) s1 += data[i][j][1];
+      for (i = 0, s2 = 0, dx = x[j][0] - x[j - 1][0]; i < n; ++i) {
+        for (k = 0, s3 = (data[i][j][1] - data[i][j - 1][1]) / (2 * dx); k < i; ++k) {
+          s3 += (data[k][j][1] - data[k][j - 1][1]) / dx;
+        }
+        s2 += s3 * data[i][j][1];
+      }
+      y0[j] = o -= s1 ? s2 / s1 * dx : 0;
+      if (o < o0) o0 = o;
+    }
+    for (j = 0; j < m; ++j) y0[j] -= o0;
+    return y0;
+  },
+
+  "expand": function(data) {
+    var n = data.length,
+        m = data[0].length,
+        k = 1 / n,
+        i,
+        j,
+        o,
+        y0 = [];
+    for (j = 0; j < m; ++j) {
+      for (i = 0, o = 0; i < n; i++) o += data[i][j][1];
+      if (o) for (i = 0; i < n; i++) data[i][j][1] /= o;
+      else for (i = 0; i < n; i++) data[i][j][1] = k;
+    }
+    for (j = 0; j < m; ++j) y0[j] = 0;
+    return y0;
+  },
+
+  "zero": d3_layout_stackOffsetZero
+
+});
+
+function d3_layout_stackOrderDefault(data) {
+  return d3.range(data.length);
+}
+
+function d3_layout_stackOffsetZero(data) {
+  var j = -1,
+      m = data[0].length,
+      y0 = [];
+  while (++j < m) y0[j] = 0;
+  return y0;
+}
+
+function d3_layout_stackMaxIndex(array) {
+  var i = 1,
+      j = 0,
+      v = array[0][1],
+      k,
+      n = array.length;
+  for (; i < n; ++i) {
+    if ((k = array[i][1]) > v) {
+      j = i;
+      v = k;
+    }
+  }
+  return j;
+}
+
+function d3_layout_stackReduceSum(d) {
+  return d.reduce(d3_layout_stackSum, 0);
+}
+
+function d3_layout_stackSum(p, d) {
+  return p + d[1];
+}
+d3.layout.histogram = function() {
+  var frequency = true,
+      valuer = Number,
+      ranger = d3_layout_histogramRange,
+      binner = d3_layout_histogramBinSturges;
+
+  function histogram(data, i) {
+    var bins = [],
+        values = data.map(valuer, this),
+        range = ranger.call(this, values, i),
+        thresholds = binner.call(this, range, values, i),
+        bin,
+        i = -1,
+        n = values.length,
+        m = thresholds.length - 1,
+        k = frequency ? 1 : 1 / n,
+        x;
+
+    // Initialize the bins.
+    while (++i < m) {
+      bin = bins[i] = [];
+      bin.dx = thresholds[i + 1] - (bin.x = thresholds[i]);
+      bin.y = 0;
+    }
+
+    // Fill the bins, ignoring values outside the range.
+    i = -1; while(++i < n) {
+      x = values[i];
+      if ((x >= range[0]) && (x <= range[1])) {
+        bin = bins[d3.bisect(thresholds, x, 1, m) - 1];
+        bin.y += k;
+        bin.push(data[i]);
+      }
+    }
+
+    return bins;
+  }
+
+  // Specifies how to extract a value from the associated data. The default
+  // value function is `Number`, which is equivalent to the identity function.
+  histogram.value = function(x) {
+    if (!arguments.length) return valuer;
+    valuer = x;
+    return histogram;
+  };
+
+  // Specifies the range of the histogram. Values outside the specified range
+  // will be ignored. The argument `x` may be specified either as a two-element
+  // array representing the minimum and maximum value of the range, or as a
+  // function that returns the range given the array of values and the current
+  // index `i`. The default range is the extent (minimum and maximum) of the
+  // values.
+  histogram.range = function(x) {
+    if (!arguments.length) return ranger;
+    ranger = d3.functor(x);
+    return histogram;
+  };
+
+  // Specifies how to bin values in the histogram. The argument `x` may be
+  // specified as a number, in which case the range of values will be split
+  // uniformly into the given number of bins. Or, `x` may be an array of
+  // threshold values, defining the bins; the specified array must contain the
+  // rightmost (upper) value, thus specifying n + 1 values for n bins. Or, `x`
+  // may be a function which is evaluated, being passed the range, the array of
+  // values, and the current index `i`, returning an array of thresholds. The
+  // default bin function will divide the values into uniform bins using
+  // Sturges' formula.
+  histogram.bins = function(x) {
+    if (!arguments.length) return binner;
+    binner = typeof x === "number"
+        ? function(range) { return d3_layout_histogramBinFixed(range, x); }
+        : d3.functor(x);
+    return histogram;
+  };
+
+  // Specifies whether the histogram's `y` value is a count (frequency) or a
+  // probability (density). The default value is true.
+  histogram.frequency = function(x) {
+    if (!arguments.length) return frequency;
+    frequency = !!x;
+    return histogram;
+  };
+
+  return histogram;
+};
+
+function d3_layout_histogramBinSturges(range, values) {
+  return d3_layout_histogramBinFixed(range, Math.ceil(Math.log(values.length) / Math.LN2 + 1));
+}
+
+function d3_layout_histogramBinFixed(range, n) {
+  var x = -1,
+      b = +range[0],
+      m = (range[1] - b) / n,
+      f = [];
+  while (++x <= n) f[x] = m * x + b;
+  return f;
+}
+
+function d3_layout_histogramRange(values) {
+  return [d3.min(values), d3.max(values)];
+}
+d3.layout.hierarchy = function() {
+  var sort = d3_layout_hierarchySort,
+      children = d3_layout_hierarchyChildren,
+      value = d3_layout_hierarchyValue;
+
+  // Recursively compute the node depth and value.
+  // Also converts the data representation into a standard hierarchy structure.
+  function recurse(data, depth, nodes) {
+    var childs = children.call(hierarchy, data, depth),
+        node = d3_layout_hierarchyInline ? data : {data: data};
+    node.depth = depth;
+    nodes.push(node);
+    if (childs && (n = childs.length)) {
+      var i = -1,
+          n,
+          c = node.children = [],
+          v = 0,
+          j = depth + 1;
+      while (++i < n) {
+        d = recurse(childs[i], j, nodes);
+        d.parent = node;
+        c.push(d);
+        v += d.value;
+      }
+      if (sort) c.sort(sort);
+      if (value) node.value = v;
+    } else if (value) {
+      node.value = +value.call(hierarchy, data, depth) || 0;
+    }
+    return node;
+  }
+
+  // Recursively re-evaluates the node value.
+  function revalue(node, depth) {
+    var children = node.children,
+        v = 0;
+    if (children && (n = children.length)) {
+      var i = -1,
+          n,
+          j = depth + 1;
+      while (++i < n) v += revalue(children[i], j);
+    } else if (value) {
+      v = +value.call(hierarchy, d3_layout_hierarchyInline ? node : node.data, depth) || 0;
+    }
+    if (value) node.value = v;
+    return v;
+  }
+
+  function hierarchy(d) {
+    var nodes = [];
+    recurse(d, 0, nodes);
+    return nodes;
+  }
+
+  hierarchy.sort = function(x) {
+    if (!arguments.length) return sort;
+    sort = x;
+    return hierarchy;
+  };
+
+  hierarchy.children = function(x) {
+    if (!arguments.length) return children;
+    children = x;
+    return hierarchy;
+  };
+
+  hierarchy.value = function(x) {
+    if (!arguments.length) return value;
+    value = x;
+    return hierarchy;
+  };
+
+  // Re-evaluates the `value` property for the specified hierarchy.
+  hierarchy.revalue = function(root) {
+    revalue(root, 0);
+    return root;
+  };
+
+  return hierarchy;
+};
+
+// A method assignment helper for hierarchy subclasses.
+function d3_layout_hierarchyRebind(object, hierarchy) {
+  d3.rebind(object, hierarchy, "sort", "children", "value");
+
+  // Add an alias for links, for convenience.
+  object.links = d3_layout_hierarchyLinks;
+
+  // If the new API is used, enabling inlining.
+  object.nodes = function(d) {
+    d3_layout_hierarchyInline = true;
+    return (object.nodes = object)(d);
+  };
+
+  return object;
+}
+
+function d3_layout_hierarchyChildren(d) {
+  return d.children;
+}
+
+function d3_layout_hierarchyValue(d) {
+  return d.value;
+}
+
+function d3_layout_hierarchySort(a, b) {
+  return b.value - a.value;
+}
+
+// Returns an array source+target objects for the specified nodes.
+function d3_layout_hierarchyLinks(nodes) {
+  return d3.merge(nodes.map(function(parent) {
+    return (parent.children || []).map(function(child) {
+      return {source: parent, target: child};
+    });
+  }));
+}
+
+// For backwards-compatibility, don't enable inlining by default.
+var d3_layout_hierarchyInline = false;
+d3.layout.pack = function() {
+  var hierarchy = d3.layout.hierarchy().sort(d3_layout_packSort),
+      size = [1, 1];
+
+  function pack(d, i) {
+    var nodes = hierarchy.call(this, d, i),
+        root = nodes[0];
+
+    // Recursively compute the layout.
+    root.x = 0;
+    root.y = 0;
+    d3_layout_packTree(root);
+
+    // Scale the layout to fit the requested size.
+    var w = size[0],
+        h = size[1],
+        k = 1 / Math.max(2 * root.r / w, 2 * root.r / h);
+    d3_layout_packTransform(root, w / 2, h / 2, k);
+
+    return nodes;
+  }
+
+  pack.size = function(x) {
+    if (!arguments.length) return size;
+    size = x;
+    return pack;
+  };
+
+  return d3_layout_hierarchyRebind(pack, hierarchy);
+};
+
+function d3_layout_packSort(a, b) {
+  return a.value - b.value;
+}
+
+function d3_layout_packInsert(a, b) {
+  var c = a._pack_next;
+  a._pack_next = b;
+  b._pack_prev = a;
+  b._pack_next = c;
+  c._pack_prev = b;
+}
+
+function d3_layout_packSplice(a, b) {
+  a._pack_next = b;
+  b._pack_prev = a;
+}
+
+function d3_layout_packIntersects(a, b) {
+  var dx = b.x - a.x,
+      dy = b.y - a.y,
+      dr = a.r + b.r;
+  return dr * dr - dx * dx - dy * dy > .001; // within epsilon
+}
+
+function d3_layout_packCircle(nodes) {
+  var xMin = Infinity,
+      xMax = -Infinity,
+      yMin = Infinity,
+      yMax = -Infinity,
+      n = nodes.length,
+      a, b, c, j, k;
+
+  function bound(node) {
+    xMin = Math.min(node.x - node.r, xMin);
+    xMax = Math.max(node.x + node.r, xMax);
+    yMin = Math.min(node.y - node.r, yMin);
+    yMax = Math.max(node.y + node.r, yMax);
+  }
+
+  // Create node links.
+  nodes.forEach(d3_layout_packLink);
+
+  // Create first node.
+  a = nodes[0];
+  a.x = -a.r;
+  a.y = 0;
+  bound(a);
+
+  // Create second node.
+  if (n > 1) {
+    b = nodes[1];
+    b.x = b.r;
+    b.y = 0;
+    bound(b);
+
+    // Create third node and build chain.
+    if (n > 2) {
+      c = nodes[2];
+      d3_layout_packPlace(a, b, c);
+      bound(c);
+      d3_layout_packInsert(a, c);
+      a._pack_prev = c;
+      d3_layout_packInsert(c, b);
+      b = a._pack_next;
+
+      // Now iterate through the rest.
+      for (var i = 3; i < n; i++) {
+        d3_layout_packPlace(a, b, c = nodes[i]);
+
+        // Search for the closest intersection.
+        var isect = 0, s1 = 1, s2 = 1;
+        for (j = b._pack_next; j !== b; j = j._pack_next, s1++) {
+          if (d3_layout_packIntersects(j, c)) {
+            isect = 1;
+            break;
+          }
+        }
+        if (isect == 1) {
+          for (k = a._pack_prev; k !== j._pack_prev; k = k._pack_prev, s2++) {
+            if (d3_layout_packIntersects(k, c)) {
+              break;
+            }
+          }
+        }
+
+        // Update node chain.
+        if (isect) {
+          if (s1 < s2 || (s1 == s2 && b.r < a.r)) d3_layout_packSplice(a, b = j);
+          else d3_layout_packSplice(a = k, b);
+          i--;
+        } else {
+          d3_layout_packInsert(a, c);
+          b = c;
+          bound(c);
+        }
+      }
+    }
+  }
+
+  // Re-center the circles and return the encompassing radius.
+  var cx = (xMin + xMax) / 2,
+      cy = (yMin + yMax) / 2,
+      cr = 0;
+  for (var i = 0; i < n; i++) {
+    var node = nodes[i];
+    node.x -= cx;
+    node.y -= cy;
+    cr = Math.max(cr, node.r + Math.sqrt(node.x * node.x + node.y * node.y));
+  }
+
+  // Remove node links.
+  nodes.forEach(d3_layout_packUnlink);
+
+  return cr;
+}
+
+function d3_layout_packLink(node) {
+  node._pack_next = node._pack_prev = node;
+}
+
+function d3_layout_packUnlink(node) {
+  delete node._pack_next;
+  delete node._pack_prev;
+}
+
+function d3_layout_packTree(node) {
+  var children = node.children;
+  if (children && children.length) {
+    children.forEach(d3_layout_packTree);
+    node.r = d3_layout_packCircle(children);
+  } else {
+    node.r = Math.sqrt(node.value);
+  }
+}
+
+function d3_layout_packTransform(node, x, y, k) {
+  var children = node.children;
+  node.x = (x += k * node.x);
+  node.y = (y += k * node.y);
+  node.r *= k;
+  if (children) {
+    var i = -1, n = children.length;
+    while (++i < n) d3_layout_packTransform(children[i], x, y, k);
+  }
+}
+
+function d3_layout_packPlace(a, b, c) {
+  var db = a.r + c.r,
+      dx = b.x - a.x,
+      dy = b.y - a.y;
+  if (db && (dx || dy)) {
+    var da = b.r + c.r,
+        dc = Math.sqrt(dx * dx + dy * dy),
+        cos = Math.max(-1, Math.min(1, (db * db + dc * dc - da * da) / (2 * db * dc))),
+        theta = Math.acos(cos),
+        x = cos * (db /= dc),
+        y = Math.sin(theta) * db;
+    c.x = a.x + x * dx + y * dy;
+    c.y = a.y + x * dy - y * dx;
+  } else {
+    c.x = a.x + db;
+    c.y = a.y;
+  }
+}
+// Implements a hierarchical layout using the cluster (or dendrogram)
+// algorithm.
+d3.layout.cluster = function() {
+  var hierarchy = d3.layout.hierarchy().sort(null).value(null),
+      separation = d3_layout_treeSeparation,
+      size = [1, 1]; // width, height
+
+  function cluster(d, i) {
+    var nodes = hierarchy.call(this, d, i),
+        root = nodes[0],
+        previousNode,
+        x = 0,
+        kx,
+        ky;
+
+    // First walk, computing the initial x & y values.
+    d3_layout_treeVisitAfter(root, function(node) {
+      var children = node.children;
+      if (children && children.length) {
+        node.x = d3_layout_clusterX(children);
+        node.y = d3_layout_clusterY(children);
+      } else {
+        node.x = previousNode ? x += separation(node, previousNode) : 0;
+        node.y = 0;
+        previousNode = node;
+      }
+    });
+
+    // Compute the left-most, right-most, and depth-most nodes for extents.
+    var left = d3_layout_clusterLeft(root),
+        right = d3_layout_clusterRight(root),
+        x0 = left.x - separation(left, right) / 2,
+        x1 = right.x + separation(right, left) / 2;
+
+    // Second walk, normalizing x & y to the desired size.
+    d3_layout_treeVisitAfter(root, function(node) {
+      node.x = (node.x - x0) / (x1 - x0) * size[0];
+      node.y = (1 - (root.y ? node.y / root.y : 1)) * size[1];
+    });
+
+    return nodes;
+  }
+
+  cluster.separation = function(x) {
+    if (!arguments.length) return separation;
+    separation = x;
+    return cluster;
+  };
+
+  cluster.size = function(x) {
+    if (!arguments.length) return size;
+    size = x;
+    return cluster;
+  };
+
+  return d3_layout_hierarchyRebind(cluster, hierarchy);
+};
+
+function d3_layout_clusterY(children) {
+  return 1 + d3.max(children, function(child) {
+    return child.y;
+  });
+}
+
+function d3_layout_clusterX(children) {
+  return children.reduce(function(x, child) {
+    return x + child.x;
+  }, 0) / children.length;
+}
+
+function d3_layout_clusterLeft(node) {
+  var children = node.children;
+  return children && children.length ? d3_layout_clusterLeft(children[0]) : node;
+}
+
+function d3_layout_clusterRight(node) {
+  var children = node.children, n;
+  return children && (n = children.length) ? d3_layout_clusterRight(children[n - 1]) : node;
+}
+// Node-link tree diagram using the Reingold-Tilford "tidy" algorithm
+d3.layout.tree = function() {
+  var hierarchy = d3.layout.hierarchy().sort(null).value(null),
+      separation = d3_layout_treeSeparation,
+      size = [1, 1]; // width, height
+
+  function tree(d, i) {
+    var nodes = hierarchy.call(this, d, i),
+        root = nodes[0];
+
+    function firstWalk(node, previousSibling) {
+      var children = node.children,
+          layout = node._tree;
+      if (children && (n = children.length)) {
+        var n,
+            firstChild = children[0],
+            previousChild,
+            ancestor = firstChild,
+            child,
+            i = -1;
+        while (++i < n) {
+          child = children[i];
+          firstWalk(child, previousChild);
+          ancestor = apportion(child, previousChild, ancestor);
+          previousChild = child;
+        }
+        d3_layout_treeShift(node);
+        var midpoint = .5 * (firstChild._tree.prelim + child._tree.prelim);
+        if (previousSibling) {
+          layout.prelim = previousSibling._tree.prelim + separation(node, previousSibling);
+          layout.mod = layout.prelim - midpoint;
+        } else {
+          layout.prelim = midpoint;
+        }
+      } else {
+        if (previousSibling) {
+          layout.prelim = previousSibling._tree.prelim + separation(node, previousSibling);
+        }
+      }
+    }
+
+    function secondWalk(node, x) {
+      node.x = node._tree.prelim + x;
+      var children = node.children;
+      if (children && (n = children.length)) {
+        var i = -1,
+            n;
+        x += node._tree.mod;
+        while (++i < n) {
+          secondWalk(children[i], x);
+        }
+      }
+    }
+
+    function apportion(node, previousSibling, ancestor) {
+      if (previousSibling) {
+        var vip = node,
+            vop = node,
+            vim = previousSibling,
+            vom = node.parent.children[0],
+            sip = vip._tree.mod,
+            sop = vop._tree.mod,
+            sim = vim._tree.mod,
+            som = vom._tree.mod,
+            shift;
+        while (vim = d3_layout_treeRight(vim), vip = d3_layout_treeLeft(vip), vim && vip) {
+          vom = d3_layout_treeLeft(vom);
+          vop = d3_layout_treeRight(vop);
+          vop._tree.ancestor = node;
+          shift = vim._tree.prelim + sim - vip._tree.prelim - sip + separation(vim, vip);
+          if (shift > 0) {
+            d3_layout_treeMove(d3_layout_treeAncestor(vim, node, ancestor), node, shift);
+            sip += shift;
+            sop += shift;
+          }
+          sim += vim._tree.mod;
+          sip += vip._tree.mod;
+          som += vom._tree.mod;
+          sop += vop._tree.mod;
+        }
+        if (vim && !d3_layout_treeRight(vop)) {
+          vop._tree.thread = vim;
+          vop._tree.mod += sim - sop;
+        }
+        if (vip && !d3_layout_treeLeft(vom)) {
+          vom._tree.thread = vip;
+          vom._tree.mod += sip - som;
+          ancestor = node;
+        }
+      }
+      return ancestor;
+    }
+
+    // Initialize temporary layout variables.
+    d3_layout_treeVisitAfter(root, function(node, previousSibling) {
+      node._tree = {
+        ancestor: node,
+        prelim: 0,
+        mod: 0,
+        change: 0,
+        shift: 0,
+        number: previousSibling ? previousSibling._tree.number + 1 : 0
+      };
+    });
+
+    // Compute the layout using Buchheim et al.'s algorithm.
+    firstWalk(root);
+    secondWalk(root, -root._tree.prelim);
+
+    // Compute the left-most, right-most, and depth-most nodes for extents.
+    var left = d3_layout_treeSearch(root, d3_layout_treeLeftmost),
+        right = d3_layout_treeSearch(root, d3_layout_treeRightmost),
+        deep = d3_layout_treeSearch(root, d3_layout_treeDeepest),
+        x0 = left.x - separation(left, right) / 2,
+        x1 = right.x + separation(right, left) / 2,
+        y1 = deep.depth || 1;
+
+    // Clear temporary layout variables; transform x and y.
+    d3_layout_treeVisitAfter(root, function(node) {
+      node.x = (node.x - x0) / (x1 - x0) * size[0];
+      node.y = node.depth / y1 * size[1];
+      delete node._tree;
+    });
+
+    return nodes;
+  }
+
+  tree.separation = function(x) {
+    if (!arguments.length) return separation;
+    separation = x;
+    return tree;
+  };
+
+  tree.size = function(x) {
+    if (!arguments.length) return size;
+    size = x;
+    return tree;
+  };
+
+  return d3_layout_hierarchyRebind(tree, hierarchy);
+};
+
+function d3_layout_treeSeparation(a, b) {
+  return a.parent == b.parent ? 1 : 2;
+}
+
+// function d3_layout_treeSeparationRadial(a, b) {
+//   return (a.parent == b.parent ? 1 : 2) / a.depth;
+// }
+
+function d3_layout_treeLeft(node) {
+  var children = node.children;
+  return children && children.length ? children[0] : node._tree.thread;
+}
+
+function d3_layout_treeRight(node) {
+  var children = node.children,
+      n;
+  return children && (n = children.length) ? children[n - 1] : node._tree.thread;
+}
+
+function d3_layout_treeSearch(node, compare) {
+  var children = node.children;
+  if (children && (n = children.length)) {
+    var child,
+        n,
+        i = -1;
+    while (++i < n) {
+      if (compare(child = d3_layout_treeSearch(children[i], compare), node) > 0) {
+        node = child;
+      }
+    }
+  }
+  return node;
+}
+
+function d3_layout_treeRightmost(a, b) {
+  return a.x - b.x;
+}
+
+function d3_layout_treeLeftmost(a, b) {
+  return b.x - a.x;
+}
+
+function d3_layout_treeDeepest(a, b) {
+  return a.depth - b.depth;
+}
+
+function d3_layout_treeVisitAfter(node, callback) {
+  function visit(node, previousSibling) {
+    var children = node.children;
+    if (children && (n = children.length)) {
+      var child,
+          previousChild = null,
+          i = -1,
+          n;
+      while (++i < n) {
+        child = children[i];
+        visit(child, previousChild);
+        previousChild = child;
+      }
+    }
+    callback(node, previousSibling);
+  }
+  visit(node, null);
+}
+
+function d3_layout_treeShift(node) {
+  var shift = 0,
+      change = 0,
+      children = node.children,
+      i = children.length,
+      child;
+  while (--i >= 0) {
+    child = children[i]._tree;
+    child.prelim += shift;
+    child.mod += shift;
+    shift += child.shift + (change += child.change);
+  }
+}
+
+function d3_layout_treeMove(ancestor, node, shift) {
+  ancestor = ancestor._tree;
+  node = node._tree;
+  var change = shift / (node.number - ancestor.number);
+  ancestor.change += change;
+  node.change -= change;
+  node.shift += shift;
+  node.prelim += shift;
+  node.mod += shift;
+}
+
+function d3_layout_treeAncestor(vim, node, ancestor) {
+  return vim._tree.ancestor.parent == node.parent
+      ? vim._tree.ancestor
+      : ancestor;
+}
+// Squarified Treemaps by Mark Bruls, Kees Huizing, and Jarke J. van Wijk
+// Modified to support a target aspect ratio by Jeff Heer
+d3.layout.treemap = function() {
+  var hierarchy = d3.layout.hierarchy(),
+      round = Math.round,
+      size = [1, 1], // width, height
+      padding = null,
+      pad = d3_layout_treemapPadNull,
+      sticky = false,
+      stickies,
+      ratio = 0.5 * (1 + Math.sqrt(5)); // golden ratio
+
+  // Compute the area for each child based on value & scale.
+  function scale(children, k) {
+    var i = -1,
+        n = children.length,
+        child,
+        area;
+    while (++i < n) {
+      area = (child = children[i]).value * (k < 0 ? 0 : k);
+      child.area = isNaN(area) || area <= 0 ? 0 : area;
+    }
+  }
+
+  // Recursively arranges the specified node's children into squarified rows.
+  function squarify(node) {
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          row = [],
+          remaining = children.slice(), // copy-on-write
+          child,
+          best = Infinity, // the best row score so far
+          score, // the current row score
+          u = Math.min(rect.dx, rect.dy), // initial orientation
+          n;
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while ((n = remaining.length) > 0) {
+        row.push(child = remaining[n - 1]);
+        row.area += child.area;
+        if ((score = worst(row, u)) <= best) { // continue with this orientation
+          remaining.pop();
+          best = score;
+        } else { // abort, and try a different orientation
+          row.area -= row.pop().area;
+          position(row, u, rect, false);
+          u = Math.min(rect.dx, rect.dy);
+          row.length = row.area = 0;
+          best = Infinity;
+        }
+      }
+      if (row.length) {
+        position(row, u, rect, true);
+        row.length = row.area = 0;
+      }
+      children.forEach(squarify);
+    }
+  }
+
+  // Recursively resizes the specified node's children into existing rows.
+  // Preserves the existing layout!
+  function stickify(node) {
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          remaining = children.slice(), // copy-on-write
+          child,
+          row = [];
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while (child = remaining.pop()) {
+        row.push(child);
+        row.area += child.area;
+        if (child.z != null) {
+          position(row, child.z ? rect.dx : rect.dy, rect, !remaining.length);
+          row.length = row.area = 0;
+        }
+      }
+      children.forEach(stickify);
+    }
+  }
+
+  // Computes the score for the specified row, as the worst aspect ratio.
+  function worst(row, u) {
+    var s = row.area,
+        r,
+        rmax = 0,
+        rmin = Infinity,
+        i = -1,
+        n = row.length;
+    while (++i < n) {
+      if (!(r = row[i].area)) continue;
+      if (r < rmin) rmin = r;
+      if (r > rmax) rmax = r;
+    }
+    s *= s;
+    u *= u;
+    return s
+        ? Math.max((u * rmax * ratio) / s, s / (u * rmin * ratio))
+        : Infinity;
+  }
+
+  // Positions the specified row of nodes. Modifies `rect`.
+  function position(row, u, rect, flush) {
+    var i = -1,
+        n = row.length,
+        x = rect.x,
+        y = rect.y,
+        v = u ? round(row.area / u) : 0,
+        o;
+    if (u == rect.dx) { // horizontal subdivision
+      if (flush || v > rect.dy) v = rect.dy; // over+underflow
+      while (++i < n) {
+        o = row[i];
+        o.x = x;
+        o.y = y;
+        o.dy = v;
+        x += o.dx = Math.min(rect.x + rect.dx - x, v ? round(o.area / v) : 0);
+      }
+      o.z = true;
+      o.dx += rect.x + rect.dx - x; // rounding error
+      rect.y += v;
+      rect.dy -= v;
+    } else { // vertical subdivision
+      if (flush || v > rect.dx) v = rect.dx; // over+underflow
+      while (++i < n) {
+        o = row[i];
+        o.x = x;
+        o.y = y;
+        o.dx = v;
+        y += o.dy = Math.min(rect.y + rect.dy - y, v ? round(o.area / v) : 0);
+      }
+      o.z = false;
+      o.dy += rect.y + rect.dy - y; // rounding error
+      rect.x += v;
+      rect.dx -= v;
+    }
+  }
+
+  function treemap(d) {
+    var nodes = stickies || hierarchy(d),
+        root = nodes[0];
+    root.x = 0;
+    root.y = 0;
+    root.dx = size[0];
+    root.dy = size[1];
+    if (stickies) hierarchy.revalue(root);
+    scale([root], root.dx * root.dy / root.value);
+    (stickies ? stickify : squarify)(root);
+    if (sticky) stickies = nodes;
+    return nodes;
+  }
+
+  treemap.size = function(x) {
+    if (!arguments.length) return size;
+    size = x;
+    return treemap;
+  };
+
+  treemap.padding = function(x) {
+    if (!arguments.length) return padding;
+
+    function padFunction(node) {
+      var p = x.call(treemap, node, node.depth);
+      return p == null
+          ? d3_layout_treemapPadNull(node)
+          : d3_layout_treemapPad(node, typeof p === "number" ? [p, p, p, p] : p);
+    }
+
+    function padConstant(node) {
+      return d3_layout_treemapPad(node, x);
+    }
+
+    var type;
+    pad = (padding = x) == null ? d3_layout_treemapPadNull
+        : (type = typeof x) === "function" ? padFunction
+        : type === "number" ? (x = [x, x, x, x], padConstant)
+        : padConstant;
+    return treemap;
+  };
+
+  treemap.round = function(x) {
+    if (!arguments.length) return round != Number;
+    round = x ? Math.round : Number;
+    return treemap;
+  };
+
+  treemap.sticky = function(x) {
+    if (!arguments.length) return sticky;
+    sticky = x;
+    stickies = null;
+    return treemap;
+  };
+
+  treemap.ratio = function(x) {
+    if (!arguments.length) return ratio;
+    ratio = x;
+    return treemap;
+  };
+
+  return d3_layout_hierarchyRebind(treemap, hierarchy);
+};
+
+function d3_layout_treemapPadNull(node) {
+  return {x: node.x, y: node.y, dx: node.dx, dy: node.dy};
+}
+
+function d3_layout_treemapPad(node, padding) {
+  var x = node.x + padding[3],
+      y = node.y + padding[0],
+      dx = node.dx - padding[1] - padding[3],
+      dy = node.dy - padding[0] - padding[2];
+  if (dx < 0) { x += dx / 2; dx = 0; }
+  if (dy < 0) { y += dy / 2; dy = 0; }
+  return {x: x, y: y, dx: dx, dy: dy};
+}
+d3.csv = function(url, callback) {
+  d3.text(url, "text/csv", function(text) {
+    callback(text && d3.csv.parse(text));
+  });
+};
+d3.csv.parse = function(text) {
+  var header;
+  return d3.csv.parseRows(text, function(row, i) {
+    if (i) {
+      var o = {}, j = -1, m = header.length;
+      while (++j < m) o[header[j]] = row[j];
+      return o;
+    } else {
+      header = row;
+      return null;
+    }
+  });
+};
+
+d3.csv.parseRows = function(text, f) {
+  var EOL = {}, // sentinel value for end-of-line
+      EOF = {}, // sentinel value for end-of-file
+      rows = [], // output rows
+      re = /\r\n|[,\r\n]/g, // field separator regex
+      n = 0, // the current line number
+      t, // the current token
+      eol; // is the current token followed by EOL?
+
+  re.lastIndex = 0; // work-around bug in FF 3.6
+
+  /** @private Returns the next token. */
+  function token() {
+    if (re.lastIndex >= text.length) return EOF; // special case: end of file
+    if (eol) { eol = false; return EOL; } // special case: end of line
+
+    // special case: quotes
+    var j = re.lastIndex;
+    if (text.charCodeAt(j) === 34) {
+      var i = j;
+      while (i++ < text.length) {
+        if (text.charCodeAt(i) === 34) {
+          if (text.charCodeAt(i + 1) !== 34) break;
+          i++;
+        }
+      }
+      re.lastIndex = i + 2;
+      var c = text.charCodeAt(i + 1);
+      if (c === 13) {
+        eol = true;
+        if (text.charCodeAt(i + 2) === 10) re.lastIndex++;
+      } else if (c === 10) {
+        eol = true;
+      }
+      return text.substring(j + 1, i).replace(/""/g, "\"");
+    }
+
+    // common case
+    var m = re.exec(text);
+    if (m) {
+      eol = m[0].charCodeAt(0) !== 44;
+      return text.substring(j, m.index);
+    }
+    re.lastIndex = text.length;
+    return text.substring(j);
+  }
+
+  while ((t = token()) !== EOF) {
+    var a = [];
+    while ((t !== EOL) && (t !== EOF)) {
+      a.push(t);
+      t = token();
+    }
+    if (f && !(a = f(a, n++))) continue;
+    rows.push(a);
+  }
+
+  return rows;
+};
+d3.csv.format = function(rows) {
+  return rows.map(d3_csv_formatRow).join("\n");
+};
+
+function d3_csv_formatRow(row) {
+  return row.map(d3_csv_formatValue).join(",");
+}
+
+function d3_csv_formatValue(text) {
+  return /[",\n]/.test(text)
+      ? "\"" + text.replace(/\"/g, "\"\"") + "\""
+      : text;
+}
+d3.geo = {};
+
+var d3_geo_radians = Math.PI / 180;
+// TODO clip input coordinates on opposite hemisphere
+d3.geo.azimuthal = function() {
+  var mode = "orthographic", // or stereographic, gnomonic, equidistant or equalarea
+      origin,
+      scale = 200,
+      translate = [480, 250],
+      x0,
+      y0,
+      cy0,
+      sy0;
+
+  function azimuthal(coordinates) {
+    var x1 = coordinates[0] * d3_geo_radians - x0,
+        y1 = coordinates[1] * d3_geo_radians,
+        cx1 = Math.cos(x1),
+        sx1 = Math.sin(x1),
+        cy1 = Math.cos(y1),
+        sy1 = Math.sin(y1),
+        cc = mode !== "orthographic" ? sy0 * sy1 + cy0 * cy1 * cx1 : null,
+        c,
+        k = mode === "stereographic" ? 1 / (1 + cc)
+          : mode === "gnomonic" ? 1 / cc
+          : mode === "equidistant" ? (c = Math.acos(cc), c ? c / Math.sin(c) : 0)
+          : mode === "equalarea" ? Math.sqrt(2 / (1 + cc))
+          : 1,
+        x = k * cy1 * sx1,
+        y = k * (sy0 * cy1 * cx1 - cy0 * sy1);
+    return [
+      scale * x + translate[0],
+      scale * y + translate[1]
+    ];
+  }
+
+  azimuthal.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale,
+        p = Math.sqrt(x * x + y * y),
+        c = mode === "stereographic" ? 2 * Math.atan(p)
+          : mode === "gnomonic" ? Math.atan(p)
+          : mode === "equidistant" ? p
+          : mode === "equalarea" ? 2 * Math.asin(.5 * p)
+          : Math.asin(p),
+        sc = Math.sin(c),
+        cc = Math.cos(c);
+    return [
+      (x0 + Math.atan2(x * sc, p * cy0 * cc + y * sy0 * sc)) / d3_geo_radians,
+      Math.asin(cc * sy0 - (p ? (y * sc * cy0) / p : 0)) / d3_geo_radians
+    ];
+  };
+
+  azimuthal.mode = function(x) {
+    if (!arguments.length) return mode;
+    mode = x + "";
+    return azimuthal;
+  };
+
+  azimuthal.origin = function(x) {
+    if (!arguments.length) return origin;
+    origin = x;
+    x0 = origin[0] * d3_geo_radians;
+    y0 = origin[1] * d3_geo_radians;
+    cy0 = Math.cos(y0);
+    sy0 = Math.sin(y0);
+    return azimuthal;
+  };
+
+  azimuthal.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = +x;
+    return azimuthal;
+  };
+
+  azimuthal.translate = function(x) {
+    if (!arguments.length) return translate;
+    translate = [+x[0], +x[1]];
+    return azimuthal;
+  };
+
+  return azimuthal.origin([0, 0]);
+};
+// Derived from Tom Carden's Albers implementation for Protovis.
+// http://gist.github.com/476238
+// http://mathworld.wolfram.com/AlbersEqual-AreaConicProjection.html
+
+d3.geo.albers = function() {
+  var origin = [-98, 38],
+      parallels = [29.5, 45.5],
+      scale = 1000,
+      translate = [480, 250],
+      lng0, // d3_geo_radians * origin[0]
+      n,
+      C,
+      p0;
+
+  function albers(coordinates) {
+    var t = n * (d3_geo_radians * coordinates[0] - lng0),
+        p = Math.sqrt(C - 2 * n * Math.sin(d3_geo_radians * coordinates[1])) / n;
+    return [
+      scale * p * Math.sin(t) + translate[0],
+      scale * (p * Math.cos(t) - p0) + translate[1]
+    ];
+  }
+
+  albers.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale,
+        p0y = p0 + y,
+        t = Math.atan2(x, p0y),
+        p = Math.sqrt(x * x + p0y * p0y);
+    return [
+      (lng0 + t / n) / d3_geo_radians,
+      Math.asin((C - p * p * n * n) / (2 * n)) / d3_geo_radians
+    ];
+  };
+
+  function reload() {
+    var phi1 = d3_geo_radians * parallels[0],
+        phi2 = d3_geo_radians * parallels[1],
+        lat0 = d3_geo_radians * origin[1],
+        s = Math.sin(phi1),
+        c = Math.cos(phi1);
+    lng0 = d3_geo_radians * origin[0];
+    n = .5 * (s + Math.sin(phi2));
+    C = c * c + 2 * n * s;
+    p0 = Math.sqrt(C - 2 * n * Math.sin(lat0)) / n;
+    return albers;
+  }
+
+  albers.origin = function(x) {
+    if (!arguments.length) return origin;
+    origin = [+x[0], +x[1]];
+    return reload();
+  };
+
+  albers.parallels = function(x) {
+    if (!arguments.length) return parallels;
+    parallels = [+x[0], +x[1]];
+    return reload();
+  };
+
+  albers.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = +x;
+    return albers;
+  };
+
+  albers.translate = function(x) {
+    if (!arguments.length) return translate;
+    translate = [+x[0], +x[1]];
+    return albers;
+  };
+
+  return reload();
+};
+
+// A composite projection for the United States, 960x500. The set of standard
+// parallels for each region comes from USGS, which is published here:
+// http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html#albers
+// TODO allow the composite projection to be rescaled?
+d3.geo.albersUsa = function() {
+  var lower48 = d3.geo.albers();
+
+  var alaska = d3.geo.albers()
+      .origin([-160, 60])
+      .parallels([55, 65]);
+
+  var hawaii = d3.geo.albers()
+      .origin([-160, 20])
+      .parallels([8, 18]);
+
+  var puertoRico = d3.geo.albers()
+      .origin([-60, 10])
+      .parallels([8, 18]);
+
+  function albersUsa(coordinates) {
+    var lon = coordinates[0],
+        lat = coordinates[1];
+    return (lat > 50 ? alaska
+        : lon < -140 ? hawaii
+        : lat < 21 ? puertoRico
+        : lower48)(coordinates);
+  }
+
+  albersUsa.scale = function(x) {
+    if (!arguments.length) return lower48.scale();
+    lower48.scale(x);
+    alaska.scale(x * .6);
+    hawaii.scale(x);
+    puertoRico.scale(x * 1.5);
+    return albersUsa.translate(lower48.translate());
+  };
+
+  albersUsa.translate = function(x) {
+    if (!arguments.length) return lower48.translate();
+    var dz = lower48.scale() / 1000,
+        dx = x[0],
+        dy = x[1];
+    lower48.translate(x);
+    alaska.translate([dx - 400 * dz, dy + 170 * dz]);
+    hawaii.translate([dx - 190 * dz, dy + 200 * dz]);
+    puertoRico.translate([dx + 580 * dz, dy + 430 * dz]);
+    return albersUsa;
+  };
+
+  return albersUsa.scale(lower48.scale());
+};
+d3.geo.bonne = function() {
+  var scale = 200,
+      translate = [480, 250],
+      x0, // origin longitude in radians
+      y0, // origin latitude in radians
+      y1, // parallel latitude in radians
+      c1; // cot(y1)
+
+  function bonne(coordinates) {
+    var x = coordinates[0] * d3_geo_radians - x0,
+        y = coordinates[1] * d3_geo_radians - y0;
+    if (y1) {
+      var p = c1 + y1 - y, E = x * Math.cos(y) / p;
+      x = p * Math.sin(E);
+      y = p * Math.cos(E) - c1;
+    } else {
+      x *= Math.cos(y);
+      y *= -1;
+    }
+    return [
+      scale * x + translate[0],
+      scale * y + translate[1]
+    ];
+  }
+
+  bonne.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale;
+    if (y1) {
+      var c = c1 + y, p = Math.sqrt(x * x + c * c);
+      y = c1 + y1 - p;
+      x = x0 + p * Math.atan2(x, c) / Math.cos(y);
+    } else {
+      y *= -1;
+      x /= Math.cos(y);
+    }
+    return [
+      x / d3_geo_radians,
+      y / d3_geo_radians
+    ];
+  };
+
+  // 90° for Werner, 0° for Sinusoidal
+  bonne.parallel = function(x) {
+    if (!arguments.length) return y1 / d3_geo_radians;
+    c1 = 1 / Math.tan(y1 = x * d3_geo_radians);
+    return bonne;
+  };
+
+  bonne.origin = function(x) {
+    if (!arguments.length) return [x0 / d3_geo_radians, y0 / d3_geo_radians];
+    x0 = x[0] * d3_geo_radians;
+    y0 = x[1] * d3_geo_radians;
+    return bonne;
+  };
+
+  bonne.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = +x;
+    return bonne;
+  };
+
+  bonne.translate = function(x) {
+    if (!arguments.length) return translate;
+    translate = [+x[0], +x[1]];
+    return bonne;
+  };
+
+  return bonne.origin([0, 0]).parallel(45);
+};
+d3.geo.equirectangular = function() {
+  var scale = 500,
+      translate = [480, 250];
+
+  function equirectangular(coordinates) {
+    var x = coordinates[0] / 360,
+        y = -coordinates[1] / 360;
+    return [
+      scale * x + translate[0],
+      scale * y + translate[1]
+    ];
+  }
+
+  equirectangular.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale;
+    return [
+      360 * x,
+      -360 * y
+    ];
+  };
+
+  equirectangular.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = +x;
+    return equirectangular;
+  };
+
+  equirectangular.translate = function(x) {
+    if (!arguments.length) return translate;
+    translate = [+x[0], +x[1]];
+    return equirectangular;
+  };
+
+  return equirectangular;
+};
+d3.geo.mercator = function() {
+  var scale = 500,
+      translate = [480, 250];
+
+  function mercator(coordinates) {
+    var x = coordinates[0] / 360,
+        y = -(Math.log(Math.tan(Math.PI / 4 + coordinates[1] * d3_geo_radians / 2)) / d3_geo_radians) / 360;
+    return [
+      scale * x + translate[0],
+      scale * Math.max(-.5, Math.min(.5, y)) + translate[1]
+    ];
+  }
+
+  mercator.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale;
+    return [
+      360 * x,
+      2 * Math.atan(Math.exp(-360 * y * d3_geo_radians)) / d3_geo_radians - 90
+    ];
+  };
+
+  mercator.scale = function(x) {
+    if (!arguments.length) return scale;
+    scale = +x;
+    return mercator;
+  };
+
+  mercator.translate = function(x) {
+    if (!arguments.length) return translate;
+    translate = [+x[0], +x[1]];
+    return mercator;
+  };
+
+  return mercator;
+};
+function d3_geo_type(types, defaultValue) {
+  return function(object) {
+    return object && types.hasOwnProperty(object.type) ? types[object.type](object) : defaultValue;
+  };
+}
+/**
+ * Returns a function that, given a GeoJSON object (e.g., a feature), returns
+ * the corresponding SVG path. The function can be customized by overriding the
+ * projection. Point features are mapped to circles with a default radius of
+ * 4.5px; the radius can be specified either as a constant or a function that
+ * is evaluated per object.
+ */
+d3.geo.path = function() {
+  var pointRadius = 4.5,
+      pointCircle = d3_path_circle(pointRadius),
+      projection = d3.geo.albersUsa();
+
+  function path(d, i) {
+    if (typeof pointRadius === "function") {
+      pointCircle = d3_path_circle(pointRadius.apply(this, arguments));
+    }
+    return pathType(d) || null;
+  }
+
+  function project(coordinates) {
+    return projection(coordinates).join(",");
+  }
+
+  var pathType = d3_geo_type({
+
+    FeatureCollection: function(o) {
+      var path = [],
+          features = o.features,
+          i = -1, // features.index
+          n = features.length;
+      while (++i < n) path.push(pathType(features[i].geometry));
+      return path.join("");
+    },
+
+    Feature: function(o) {
+      return pathType(o.geometry);
+    },
+
+    Point: function(o) {
+      return "M" + project(o.coordinates) + pointCircle;
+    },
+
+    MultiPoint: function(o) {
+      var path = [],
+          coordinates = o.coordinates,
+          i = -1, // coordinates.index
+          n = coordinates.length;
+      while (++i < n) path.push("M", project(coordinates[i]), pointCircle);
+      return path.join("");
+    },
+
+    LineString: function(o) {
+      var path = ["M"],
+          coordinates = o.coordinates,
+          i = -1, // coordinates.index
+          n = coordinates.length;
+      while (++i < n) path.push(project(coordinates[i]), "L");
+      path.pop();
+      return path.join("");
+    },
+
+    MultiLineString: function(o) {
+      var path = [],
+          coordinates = o.coordinates,
+          i = -1, // coordinates.index
+          n = coordinates.length,
+          subcoordinates, // coordinates[i]
+          j, // subcoordinates.index
+          m; // subcoordinates.length
+      while (++i < n) {
+        subcoordinates = coordinates[i];
+        j = -1;
+        m = subcoordinates.length;
+        path.push("M");
+        while (++j < m) path.push(project(subcoordinates[j]), "L");
+        path.pop();
+      }
+      return path.join("");
+    },
+
+    Polygon: function(o) {
+      var path = [],
+          coordinates = o.coordinates,
+          i = -1, // coordinates.index
+          n = coordinates.length,
+          subcoordinates, // coordinates[i]
+          j, // subcoordinates.index
+          m; // subcoordinates.length
+      while (++i < n) {
+        subcoordinates = coordinates[i];
+        j = -1;
+        if ((m = subcoordinates.length - 1) > 0) {
+          path.push("M");
+          while (++j < m) path.push(project(subcoordinates[j]), "L");
+          path[path.length - 1] = "Z";
+        }
+      }
+      return path.join("");
+    },
+
+    MultiPolygon: function(o) {
+      var path = [],
+          coordinates = o.coordinates,
+          i = -1, // coordinates index
+          n = coordinates.length,
+          subcoordinates, // coordinates[i]
+          j, // subcoordinates index
+          m, // subcoordinates.length
+          subsubcoordinates, // subcoordinates[j]
+          k, // subsubcoordinates index
+          p; // subsubcoordinates.length
+      while (++i < n) {
+        subcoordinates = coordinates[i];
+        j = -1;
+        m = subcoordinates.length;
+        while (++j < m) {
+          subsubcoordinates = subcoordinates[j];
+          k = -1;
+          if ((p = subsubcoordinates.length - 1) > 0) {
+            path.push("M");
+            while (++k < p) path.push(project(subsubcoordinates[k]), "L");
+            path[path.length - 1] = "Z";
+          }
+        }
+      }
+      return path.join("");
+    },
+
+    GeometryCollection: function(o) {
+      var path = [],
+          geometries = o.geometries,
+          i = -1, // geometries index
+          n = geometries.length;
+      while (++i < n) path.push(pathType(geometries[i]));
+      return path.join("");
+    }
+
+  });
+
+  var areaType = path.area = d3_geo_type({
+
+    FeatureCollection: function(o) {
+      var area = 0,
+          features = o.features,
+          i = -1, // features.index
+          n = features.length;
+      while (++i < n) area += areaType(features[i]);
+      return area;
+    },
+
+    Feature: function(o) {
+      return areaType(o.geometry);
+    },
+
+    Polygon: function(o) {
+      return polygonArea(o.coordinates);
+    },
+
+    MultiPolygon: function(o) {
+      var sum = 0,
+          coordinates = o.coordinates,
+          i = -1, // coordinates index
+          n = coordinates.length;
+      while (++i < n) sum += polygonArea(coordinates[i]);
+      return sum;
+    },
+
+    GeometryCollection: function(o) {
+      var sum = 0,
+          geometries = o.geometries,
+          i = -1, // geometries index
+          n = geometries.length;
+      while (++i < n) sum += areaType(geometries[i]);
+      return sum;
+    }
+
+  }, 0);
+
+  function polygonArea(coordinates) {
+    var sum = area(coordinates[0]), // exterior ring
+        i = 0, // coordinates.index
+        n = coordinates.length;
+    while (++i < n) sum -= area(coordinates[i]); // holes
+    return sum;
+  }
+
+  function polygonCentroid(coordinates) {
+    var polygon = d3.geom.polygon(coordinates[0].map(projection)), // exterior ring
+        area = polygon.area(),
+        centroid = polygon.centroid(area < 0 ? (area *= -1, 1) : -1),
+        x = centroid[0],
+        y = centroid[1],
+        z = area,
+        i = 0, // coordinates index
+        n = coordinates.length;
+    while (++i < n) {
+      polygon = d3.geom.polygon(coordinates[i].map(projection)); // holes
+      area = polygon.area();
+      centroid = polygon.centroid(area < 0 ? (area *= -1, 1) : -1);
+      x -= centroid[0];
+      y -= centroid[1];
+      z -= area;
+    }
+    return [x, y, 6 * z]; // weighted centroid
+  }
+
+  var centroidType = path.centroid = d3_geo_type({
+
+    // TODO FeatureCollection
+    // TODO Point
+    // TODO MultiPoint
+    // TODO LineString
+    // TODO MultiLineString
+    // TODO GeometryCollection
+
+    Feature: function(o) {
+      return centroidType(o.geometry);
+    },
+
+    Polygon: function(o) {
+      var centroid = polygonCentroid(o.coordinates);
+      return [centroid[0] / centroid[2], centroid[1] / centroid[2]];
+    },
+
+    MultiPolygon: function(o) {
+      var area = 0,
+          coordinates = o.coordinates,
+          centroid,
+          x = 0,
+          y = 0,
+          z = 0,
+          i = -1, // coordinates index
+          n = coordinates.length;
+      while (++i < n) {
+        centroid = polygonCentroid(coordinates[i]);
+        x += centroid[0];
+        y += centroid[1];
+        z += centroid[2];
+      }
+      return [x / z, y / z];
+    }
+
+  });
+
+  function area(coordinates) {
+    return Math.abs(d3.geom.polygon(coordinates.map(projection)).area());
+  }
+
+  path.projection = function(x) {
+    projection = x;
+    return path;
+  };
+
+  path.pointRadius = function(x) {
+    if (typeof x === "function") pointRadius = x;
+    else {
+      pointRadius = +x;
+      pointCircle = d3_path_circle(pointRadius);
+    }
+    return path;
+  };
+
+  return path;
+};
+
+function d3_path_circle(radius) {
+  return "m0," + radius
+      + "a" + radius + "," + radius + " 0 1,1 0," + (-2 * radius)
+      + "a" + radius + "," + radius + " 0 1,1 0," + (+2 * radius)
+      + "z";
+}
+/**
+ * Given a GeoJSON object, returns the corresponding bounding box. The bounding
+ * box is represented by a two-dimensional array: [[left, bottom], [right,
+ * top]], where left is the minimum longitude, bottom is the minimum latitude,
+ * right is maximum longitude, and top is the maximum latitude.
+ */
+d3.geo.bounds = function(feature) {
+  var left = Infinity,
+      bottom = Infinity,
+      right = -Infinity,
+      top = -Infinity;
+  d3_geo_bounds(feature, function(x, y) {
+    if (x < left) left = x;
+    if (x > right) right = x;
+    if (y < bottom) bottom = y;
+    if (y > top) top = y;
+  });
+  return [[left, bottom], [right, top]];
+};
+
+function d3_geo_bounds(o, f) {
+  if (d3_geo_boundsTypes.hasOwnProperty(o.type)) d3_geo_boundsTypes[o.type](o, f);
+}
+
+var d3_geo_boundsTypes = {
+  Feature: d3_geo_boundsFeature,
+  FeatureCollection: d3_geo_boundsFeatureCollection,
+  GeometryCollection: d3_geo_boundsGeometryCollection,
+  LineString: d3_geo_boundsLineString,
+  MultiLineString: d3_geo_boundsMultiLineString,
+  MultiPoint: d3_geo_boundsLineString,
+  MultiPolygon: d3_geo_boundsMultiPolygon,
+  Point: d3_geo_boundsPoint,
+  Polygon: d3_geo_boundsPolygon
+};
+
+function d3_geo_boundsFeature(o, f) {
+  d3_geo_bounds(o.geometry, f);
+}
+
+function d3_geo_boundsFeatureCollection(o, f) {
+  for (var a = o.features, i = 0, n = a.length; i < n; i++) {
+    d3_geo_bounds(a[i].geometry, f);
+  }
+}
+
+function d3_geo_boundsGeometryCollection(o, f) {
+  for (var a = o.geometries, i = 0, n = a.length; i < n; i++) {
+    d3_geo_bounds(a[i], f);
+  }
+}
+
+function d3_geo_boundsLineString(o, f) {
+  for (var a = o.coordinates, i = 0, n = a.length; i < n; i++) {
+    f.apply(null, a[i]);
+  }
+}
+
+function d3_geo_boundsMultiLineString(o, f) {
+  for (var a = o.coordinates, i = 0, n = a.length; i < n; i++) {
+    for (var b = a[i], j = 0, m = b.length; j < m; j++) {
+      f.apply(null, b[j]);
+    }
+  }
+}
+
+function d3_geo_boundsMultiPolygon(o, f) {
+  for (var a = o.coordinates, i = 0, n = a.length; i < n; i++) {
+    for (var b = a[i][0], j = 0, m = b.length; j < m; j++) {
+      f.apply(null, b[j]);
+    }
+  }
+}
+
+function d3_geo_boundsPoint(o, f) {
+  f.apply(null, o.coordinates);
+}
+
+function d3_geo_boundsPolygon(o, f) {
+  for (var a = o.coordinates[0], i = 0, n = a.length; i < n; i++) {
+    f.apply(null, a[i]);
+  }
+}
+// TODO breakAtDateLine?
+
+d3.geo.circle = function() {
+  var origin = [0, 0],
+      degrees = 90 - 1e-2,
+      radians = degrees * d3_geo_radians,
+      arc = d3.geo.greatArc().target(Object);
+
+  function circle() {
+    // TODO render a circle as a Polygon
+  }
+
+  function visible(point) {
+    return arc.distance(point) < radians;
+  }
+
+  circle.clip = function(d) {
+    arc.source(typeof origin === "function" ? origin.apply(this, arguments) : origin);
+    return clipType(d);
+  };
+
+  var clipType = d3_geo_type({
+
+    FeatureCollection: function(o) {
+      var features = o.features.map(clipType).filter(Object);
+      return features && (o = Object.create(o), o.features = features, o);
+    },
+
+    Feature: function(o) {
+      var geometry = clipType(o.geometry);
+      return geometry && (o = Object.create(o), o.geometry = geometry, o);
+    },
+
+    Point: function(o) {
+      return visible(o.coordinates) && o;
+    },
+
+    MultiPoint: function(o) {
+      var coordinates = o.coordinates.filter(visible);
+      return coordinates.length && {
+        type: o.type,
+        coordinates: coordinates
+      };
+    },
+
+    LineString: function(o) {
+      var coordinates = clip(o.coordinates);
+      return coordinates.length && (o = Object.create(o), o.coordinates = coordinates, o);
+    },
+
+    MultiLineString: function(o) {
+      var coordinates = o.coordinates.map(clip).filter(function(d) { return d.length; });
+      return coordinates.length && (o = Object.create(o), o.coordinates = coordinates, o);
+    },
+
+    Polygon: function(o) {
+      var coordinates = o.coordinates.map(clip);
+      return coordinates[0].length && (o = Object.create(o), o.coordinates = coordinates, o);
+    },
+
+    MultiPolygon: function(o) {
+      var coordinates = o.coordinates.map(function(d) { return d.map(clip); }).filter(function(d) { return d[0].length; });
+      return coordinates.length && (o = Object.create(o), o.coordinates = coordinates, o);
+    },
+
+    GeometryCollection: function(o) {
+      var geometries = o.geometries.map(clipType).filter(Object);
+      return geometries.length && (o = Object.create(o), o.geometries = geometries, o);
+    }
+
+  });
+
+  function clip(coordinates) {
+    var i = -1,
+        n = coordinates.length,
+        clipped = [],
+        p0,
+        p1,
+        p2,
+        d0,
+        d1;
+
+    while (++i < n) {
+      d1 = arc.distance(p2 = coordinates[i]);
+      if (d1 < radians) {
+        if (p1) clipped.push(d3_geo_greatArcInterpolate(p1, p2)((d0 - radians) / (d0 - d1)));
+        clipped.push(p2);
+        p0 = p1 = null;
+      } else {
+        p1 = p2;
+        if (!p0 && clipped.length) {
+          clipped.push(d3_geo_greatArcInterpolate(clipped[clipped.length - 1], p1)((radians - d0) / (d1 - d0)));
+          p0 = p1;
+        }
+      }
+      d0 = d1;
+    }
+
+    if (p1 && clipped.length) {
+      d1 = arc.distance(p2 = clipped[0]);
+      clipped.push(d3_geo_greatArcInterpolate(p1, p2)((d0 - radians) / (d0 - d1)));
+    }
+
+    return resample(clipped);
+  }
+
+  // Resample coordinates, creating great arcs between each.
+  function resample(coordinates) {
+    var i = 0,
+        n = coordinates.length,
+        j,
+        m,
+        resampled = n ? [coordinates[0]] : coordinates,
+        resamples,
+        origin = arc.source();
+
+    while (++i < n) {
+      resamples = arc.source(coordinates[i - 1])(coordinates[i]).coordinates;
+      for (j = 0, m = resamples.length; ++j < m;) resampled.push(resamples[j]);
+    }
+
+    arc.source(origin);
+    return resampled;
+  }
+
+  circle.origin = function(x) {
+    if (!arguments.length) return origin;
+    origin = x;
+    return circle;
+  };
+
+  circle.angle = function(x) {
+    if (!arguments.length) return degrees;
+    radians = (degrees = +x) * d3_geo_radians;
+    return circle;
+  };
+
+  // Precision is specified in degrees.
+  circle.precision = function(x) {
+    if (!arguments.length) return arc.precision();
+    arc.precision(x);
+    return circle;
+  };
+
+  return circle;
+}
+d3.geo.greatArc = function() {
+  var source = d3_geo_greatArcSource,
+      target = d3_geo_greatArcTarget,
+      precision = 6 * d3_geo_radians;
+
+  function greatArc() {
+    var a = typeof source === "function" ? source.apply(this, arguments) : source,
+        b = typeof target === "function" ? target.apply(this, arguments) : target,
+        i = d3_geo_greatArcInterpolate(a, b),
+        dt = precision / i.d,
+        t = 0,
+        coordinates = [a];
+    while ((t += dt) < 1) coordinates.push(i(t));
+    coordinates.push(b);
+    return {
+      type: "LineString",
+      coordinates: coordinates
+    };
+  }
+
+  // Length returned in radians; multiply by radius for distance.
+  greatArc.distance = function() {
+    var a = typeof source === "function" ? source.apply(this, arguments) : source,
+        b = typeof target === "function" ? target.apply(this, arguments) : target;
+     return d3_geo_greatArcInterpolate(a, b).d;
+  };
+
+  greatArc.source = function(x) {
+    if (!arguments.length) return source;
+    source = x;
+    return greatArc;
+  };
+
+  greatArc.target = function(x) {
+    if (!arguments.length) return target;
+    target = x;
+    return greatArc;
+  };
+
+  // Precision is specified in degrees.
+  greatArc.precision = function(x) {
+    if (!arguments.length) return precision / d3_geo_radians;
+    precision = x * d3_geo_radians;
+    return greatArc;
+  };
+
+  return greatArc;
+};
+
+function d3_geo_greatArcSource(d) {
+  return d.source;
+}
+
+function d3_geo_greatArcTarget(d) {
+  return d.target;
+}
+
+function d3_geo_greatArcInterpolate(a, b) {
+  var x0 = a[0] * d3_geo_radians, cx0 = Math.cos(x0), sx0 = Math.sin(x0),
+      y0 = a[1] * d3_geo_radians, cy0 = Math.cos(y0), sy0 = Math.sin(y0),
+      x1 = b[0] * d3_geo_radians, cx1 = Math.cos(x1), sx1 = Math.sin(x1),
+      y1 = b[1] * d3_geo_radians, cy1 = Math.cos(y1), sy1 = Math.sin(y1),
+      d = interpolate.d = Math.acos(Math.max(-1, Math.min(1, sy0 * sy1 + cy0 * cy1 * Math.cos(x1 - x0)))),
+      sd = Math.sin(d);
+
+  // From http://williams.best.vwh.net/avform.htm#Intermediate
+  function interpolate(t) {
+    var A = Math.sin(d - (t *= d)) / sd,
+        B = Math.sin(t) / sd,
+        x = A * cy0 * cx0 + B * cy1 * cx1,
+        y = A * cy0 * sx0 + B * cy1 * sx1,
+        z = A * sy0       + B * sy1;
+    return [
+      Math.atan2(y, x) / d3_geo_radians,
+      Math.atan2(z, Math.sqrt(x * x + y * y)) / d3_geo_radians
+    ];
+  }
+
+  return interpolate;
+}
+d3.geo.greatCircle = d3.geo.circle;
+d3.geom = {};
+/**
+ * Computes a contour for a given input grid function using the <a
+ * href="http://en.wikipedia.org/wiki/Marching_squares">marching
+ * squares</a> algorithm. Returns the contour polygon as an array of points.
+ *
+ * @param grid a two-input function(x, y) that returns true for values
+ * inside the contour and false for values outside the contour.
+ * @param start an optional starting point [x, y] on the grid.
+ * @returns polygon [[x1, y1], [x2, y2], …]
+ */
+d3.geom.contour = function(grid, start) {
+  var s = start || d3_geom_contourStart(grid), // starting point
+      c = [],    // contour polygon
+      x = s[0],  // current x position
+      y = s[1],  // current y position
+      dx = 0,    // next x direction
+      dy = 0,    // next y direction
+      pdx = NaN, // previous x direction
+      pdy = NaN, // previous y direction
+      i = 0;
+
+  do {
+    // determine marching squares index
+    i = 0;
+    if (grid(x-1, y-1)) i += 1;
+    if (grid(x,   y-1)) i += 2;
+    if (grid(x-1, y  )) i += 4;
+    if (grid(x,   y  )) i += 8;
+
+    // determine next direction
+    if (i === 6) {
+      dx = pdy === -1 ? -1 : 1;
+      dy = 0;
+    } else if (i === 9) {
+      dx = 0;
+      dy = pdx === 1 ? -1 : 1;
+    } else {
+      dx = d3_geom_contourDx[i];
+      dy = d3_geom_contourDy[i];
+    }
+
+    // update contour polygon
+    if (dx != pdx && dy != pdy) {
+      c.push([x, y]);
+      pdx = dx;
+      pdy = dy;
+    }
+
+    x += dx;
+    y += dy;
+  } while (s[0] != x || s[1] != y);
+
+  return c;
+};
+
+// lookup tables for marching directions
+var d3_geom_contourDx = [1, 0, 1, 1,-1, 0,-1, 1,0, 0,0,0,-1, 0,-1,NaN],
+    d3_geom_contourDy = [0,-1, 0, 0, 0,-1, 0, 0,1,-1,1,1, 0,-1, 0,NaN];
+
+function d3_geom_contourStart(grid) {
+  var x = 0,
+      y = 0;
+
+  // search for a starting point; begin at origin
+  // and proceed along outward-expanding diagonals
+  while (true) {
+    if (grid(x,y)) {
+      return [x,y];
+    }
+    if (x === 0) {
+      x = y + 1;
+      y = 0;
+    } else {
+      x = x - 1;
+      y = y + 1;
+    }
+  }
+}
+/**
+ * Computes the 2D convex hull of a set of points using Graham's scanning
+ * algorithm. The algorithm has been implemented as described in Cormen,
+ * Leiserson, and Rivest's Introduction to Algorithms. The running time of
+ * this algorithm is O(n log n), where n is the number of input points.
+ *
+ * @param vertices [[x1, y1], [x2, y2], …]
+ * @returns polygon [[x1, y1], [x2, y2], …]
+ */
+d3.geom.hull = function(vertices) {
+  if (vertices.length < 3) return [];
+
+  var len = vertices.length,
+      plen = len - 1,
+      points = [],
+      stack = [],
+      i, j, h = 0, x1, y1, x2, y2, u, v, a, sp;
+
+  // find the starting ref point: leftmost point with the minimum y coord
+  for (i=1; i<len; ++i) {
+    if (vertices[i][1] < vertices[h][1]) {
+      h = i;
+    } else if (vertices[i][1] == vertices[h][1]) {
+      h = (vertices[i][0] < vertices[h][0] ? i : h);
+    }
+  }
+
+  // calculate polar angles from ref point and sort
+  for (i=0; i<len; ++i) {
+    if (i === h) continue;
+    y1 = vertices[i][1] - vertices[h][1];
+    x1 = vertices[i][0] - vertices[h][0];
+    points.push({angle: Math.atan2(y1, x1), index: i});
+  }
+  points.sort(function(a, b) { return a.angle - b.angle; });
+
+  // toss out duplicate angles
+  a = points[0].angle;
+  v = points[0].index;
+  u = 0;
+  for (i=1; i<plen; ++i) {
+    j = points[i].index;
+    if (a == points[i].angle) {
+      // keep angle for point most distant from the reference
+      x1 = vertices[v][0] - vertices[h][0];
+      y1 = vertices[v][1] - vertices[h][1];
+      x2 = vertices[j][0] - vertices[h][0];
+      y2 = vertices[j][1] - vertices[h][1];
+      if ((x1*x1 + y1*y1) >= (x2*x2 + y2*y2)) {
+        points[i].index = -1;
+      } else {
+        points[u].index = -1;
+        a = points[i].angle;
+        u = i;
+        v = j;
+      }
+    } else {
+      a = points[i].angle;
+      u = i;
+      v = j;
+    }
+  }
+
+  // initialize the stack
+  stack.push(h);
+  for (i=0, j=0; i<2; ++j) {
+    if (points[j].index !== -1) {
+      stack.push(points[j].index);
+      i++;
+    }
+  }
+  sp = stack.length;
+
+  // do graham's scan
+  for (; j<plen; ++j) {
+    if (points[j].index === -1) continue; // skip tossed out points
+    while (!d3_geom_hullCCW(stack[sp-2], stack[sp-1], points[j].index, vertices)) {
+      --sp;
+    }
+    stack[sp++] = points[j].index;
+  }
+
+  // construct the hull
+  var poly = [];
+  for (i=0; i<sp; ++i) {
+    poly.push(vertices[stack[i]]);
+  }
+  return poly;
+}
+
+// are three points in counter-clockwise order?
+function d3_geom_hullCCW(i1, i2, i3, v) {
+  var t, a, b, c, d, e, f;
+  t = v[i1]; a = t[0]; b = t[1];
+  t = v[i2]; c = t[0]; d = t[1];
+  t = v[i3]; e = t[0]; f = t[1];
+  return ((f-b)*(c-a) - (d-b)*(e-a)) > 0;
+}
+// Note: requires coordinates to be counterclockwise and convex!
+d3.geom.polygon = function(coordinates) {
+
+  coordinates.area = function() {
+    var i = 0,
+        n = coordinates.length,
+        a = coordinates[n - 1][0] * coordinates[0][1],
+        b = coordinates[n - 1][1] * coordinates[0][0];
+    while (++i < n) {
+      a += coordinates[i - 1][0] * coordinates[i][1];
+      b += coordinates[i - 1][1] * coordinates[i][0];
+    }
+    return (b - a) * .5;
+  };
+
+  coordinates.centroid = function(k) {
+    var i = -1,
+        n = coordinates.length,
+        x = 0,
+        y = 0,
+        a,
+        b = coordinates[n - 1],
+        c;
+    if (!arguments.length) k = -1 / (6 * coordinates.area());
+    while (++i < n) {
+      a = b;
+      b = coordinates[i];
+      c = a[0] * b[1] - b[0] * a[1];
+      x += (a[0] + b[0]) * c;
+      y += (a[1] + b[1]) * c;
+    }
+    return [x * k, y * k];
+  };
+
+  // The Sutherland-Hodgman clipping algorithm.
+  coordinates.clip = function(subject) {
+    var input,
+        i = -1,
+        n = coordinates.length,
+        j,
+        m,
+        a = coordinates[n - 1],
+        b,
+        c,
+        d;
+    while (++i < n) {
+      input = subject.slice();
+      subject.length = 0;
+      b = coordinates[i];
+      c = input[(m = input.length) - 1];
+      j = -1;
+      while (++j < m) {
+        d = input[j];
+        if (d3_geom_polygonInside(d, a, b)) {
+          if (!d3_geom_polygonInside(c, a, b)) {
+            subject.push(d3_geom_polygonIntersect(c, d, a, b));
+          }
+          subject.push(d);
+        } else if (d3_geom_polygonInside(c, a, b)) {
+          subject.push(d3_geom_polygonIntersect(c, d, a, b));
+        }
+        c = d;
+      }
+      a = b;
+    }
+    return subject;
+  };
+
+  return coordinates;
+};
+
+function d3_geom_polygonInside(p, a, b) {
+  return (b[0] - a[0]) * (p[1] - a[1]) < (b[1] - a[1]) * (p[0] - a[0]);
+}
+
+// Intersect two infinite lines cd and ab.
+function d3_geom_polygonIntersect(c, d, a, b) {
+  var x1 = c[0], x2 = d[0], x3 = a[0], x4 = b[0],
+      y1 = c[1], y2 = d[1], y3 = a[1], y4 = b[1],
+      x13 = x1 - x3,
+      x21 = x2 - x1,
+      x43 = x4 - x3,
+      y13 = y1 - y3,
+      y21 = y2 - y1,
+      y43 = y4 - y3,
+      ua = (x43 * y13 - y43 * x13) / (y43 * x21 - x43 * y21);
+  return [x1 + ua * x21, y1 + ua * y21];
+}
+// Adapted from Nicolas Garcia Belmonte's JIT implementation:
+// http://blog.thejit.org/2010/02/12/voronoi-tessellation/
+// http://blog.thejit.org/assets/voronoijs/voronoi.js
+// See lib/jit/LICENSE for details.
+
+// Notes:
+//
+// This implementation does not clip the returned polygons, so if you want to
+// clip them to a particular shape you will need to do that either in SVG or by
+// post-processing with d3.geom.polygon's clip method.
+//
+// If any vertices are coincident or have NaN positions, the behavior of this
+// method is undefined. Most likely invalid polygons will be returned. You
+// should filter invalid points, and consolidate coincident points, before
+// computing the tessellation.
+
+/**
+ * @param vertices [[x1, y1], [x2, y2], …]
+ * @returns polygons [[[x1, y1], [x2, y2], …], …]
+ */
+d3.geom.voronoi = function(vertices) {
+  var polygons = vertices.map(function() { return []; });
+
+  d3_voronoi_tessellate(vertices, function(e) {
+    var s1,
+        s2,
+        x1,
+        x2,
+        y1,
+        y2;
+    if (e.a === 1 && e.b >= 0) {
+      s1 = e.ep.r;
+      s2 = e.ep.l;
+    } else {
+      s1 = e.ep.l;
+      s2 = e.ep.r;
+    }
+    if (e.a === 1) {
+      y1 = s1 ? s1.y : -1e6;
+      x1 = e.c - e.b * y1;
+      y2 = s2 ? s2.y : 1e6;
+      x2 = e.c - e.b * y2;
+    } else {
+      x1 = s1 ? s1.x : -1e6;
+      y1 = e.c - e.a * x1;
+      x2 = s2 ? s2.x : 1e6;
+      y2 = e.c - e.a * x2;
+    }
+    var v1 = [x1, y1],
+        v2 = [x2, y2];
+    polygons[e.region.l.index].push(v1, v2);
+    polygons[e.region.r.index].push(v1, v2);
+  });
+
+  // Reconnect the polygon segments into counterclockwise loops.
+  return polygons.map(function(polygon, i) {
+    var cx = vertices[i][0],
+        cy = vertices[i][1];
+    polygon.forEach(function(v) {
+      v.angle = Math.atan2(v[0] - cx, v[1] - cy);
+    });
+    return polygon.sort(function(a, b) {
+      return a.angle - b.angle;
+    }).filter(function(d, i) {
+      return !i || (d.angle - polygon[i - 1].angle > 1e-10);
+    });
+  });
+};
+
+var d3_voronoi_opposite = {"l": "r", "r": "l"};
+
+function d3_voronoi_tessellate(vertices, callback) {
+
+  var Sites = {
+    list: vertices
+      .map(function(v, i) {
+        return {
+          index: i,
+          x: v[0],
+          y: v[1]
+        };
+      })
+      .sort(function(a, b) {
+        return a.y < b.y ? -1
+          : a.y > b.y ? 1
+          : a.x < b.x ? -1
+          : a.x > b.x ? 1
+          : 0;
+      }),
+    bottomSite: null
+  };
+
+  var EdgeList = {
+    list: [],
+    leftEnd: null,
+    rightEnd: null,
+
+    init: function() {
+      EdgeList.leftEnd = EdgeList.createHalfEdge(null, "l");
+      EdgeList.rightEnd = EdgeList.createHalfEdge(null, "l");
+      EdgeList.leftEnd.r = EdgeList.rightEnd;
+      EdgeList.rightEnd.l = EdgeList.leftEnd;
+      EdgeList.list.unshift(EdgeList.leftEnd, EdgeList.rightEnd);
+    },
+
+    createHalfEdge: function(edge, side) {
+      return {
+        edge: edge,
+        side: side,
+        vertex: null,
+        "l": null,
+        "r": null
+      };
+    },
+
+    insert: function(lb, he) {
+      he.l = lb;
+      he.r = lb.r;
+      lb.r.l = he;
+      lb.r = he;
+    },
+
+    leftBound: function(p) {
+      var he = EdgeList.leftEnd;
+      do {
+        he = he.r;
+      } while (he != EdgeList.rightEnd && Geom.rightOf(he, p));
+      he = he.l;
+      return he;
+    },
+
+    del: function(he) {
+      he.l.r = he.r;
+      he.r.l = he.l;
+      he.edge = null;
+    },
+
+    right: function(he) {
+      return he.r;
+    },
+
+    left: function(he) {
+      return he.l;
+    },
+
+    leftRegion: function(he) {
+      return he.edge == null
+          ? Sites.bottomSite
+          : he.edge.region[he.side];
+    },
+
+    rightRegion: function(he) {
+      return he.edge == null
+          ? Sites.bottomSite
+          : he.edge.region[d3_voronoi_opposite[he.side]];
+    }
+  };
+
+  var Geom = {
+
+    bisect: function(s1, s2) {
+      var newEdge = {
+        region: {"l": s1, "r": s2},
+        ep: {"l": null, "r": null}
+      };
+
+      var dx = s2.x - s1.x,
+          dy = s2.y - s1.y,
+          adx = dx > 0 ? dx : -dx,
+          ady = dy > 0 ? dy : -dy;
+
+      newEdge.c = s1.x * dx + s1.y * dy
+          + (dx * dx + dy * dy) * .5;
+
+      if (adx > ady) {
+        newEdge.a = 1;
+        newEdge.b = dy / dx;
+        newEdge.c /= dx;
+      } else {
+        newEdge.b = 1;
+        newEdge.a = dx / dy;
+        newEdge.c /= dy;
+      }
+
+      return newEdge;
+    },
+
+    intersect: function(el1, el2) {
+      var e1 = el1.edge,
+          e2 = el2.edge;
+      if (!e1 || !e2 || (e1.region.r == e2.region.r)) {
+        return null;
+      }
+      var d = (e1.a * e2.b) - (e1.b * e2.a);
+      if (Math.abs(d) < 1e-10) {
+        return null;
+      }
+      var xint = (e1.c * e2.b - e2.c * e1.b) / d,
+          yint = (e2.c * e1.a - e1.c * e2.a) / d,
+          e1r = e1.region.r,
+          e2r = e2.region.r,
+          el,
+          e;
+      if ((e1r.y < e2r.y) ||
+         (e1r.y == e2r.y && e1r.x < e2r.x)) {
+        el = el1;
+        e = e1;
+      } else {
+        el = el2;
+        e = e2;
+      }
+      var rightOfSite = (xint >= e.region.r.x);
+      if ((rightOfSite && (el.side === "l")) ||
+        (!rightOfSite && (el.side === "r"))) {
+        return null;
+      }
+      return {
+        x: xint,
+        y: yint
+      };
+    },
+
+    rightOf: function(he, p) {
+      var e = he.edge,
+          topsite = e.region.r,
+          rightOfSite = (p.x > topsite.x);
+
+      if (rightOfSite && (he.side === "l")) {
+        return 1;
+      }
+      if (!rightOfSite && (he.side === "r")) {
+        return 0;
+      }
+      if (e.a === 1) {
+        var dyp = p.y - topsite.y,
+            dxp = p.x - topsite.x,
+            fast = 0,
+            above = 0;
+
+        if ((!rightOfSite && (e.b < 0)) ||
+          (rightOfSite && (e.b >= 0))) {
+          above = fast = (dyp >= e.b * dxp);
+        } else {
+          above = ((p.x + p.y * e.b) > e.c);
+          if (e.b < 0) {
+            above = !above;
+          }
+          if (!above) {
+            fast = 1;
+          }
+        }
+        if (!fast) {
+          var dxs = topsite.x - e.region.l.x;
+          above = (e.b * (dxp * dxp - dyp * dyp)) <
+            (dxs * dyp * (1 + 2 * dxp / dxs + e.b * e.b));
+
+          if (e.b < 0) {
+            above = !above;
+          }
+        }
+      } else /* e.b == 1 */ {
+        var yl = e.c - e.a * p.x,
+            t1 = p.y - yl,
+            t2 = p.x - topsite.x,
+            t3 = yl - topsite.y;
+
+        above = (t1 * t1) > (t2 * t2 + t3 * t3);
+      }
+      return he.side === "l" ? above : !above;
+    },
+
+    endPoint: function(edge, side, site) {
+      edge.ep[side] = site;
+      if (!edge.ep[d3_voronoi_opposite[side]]) return;
+      callback(edge);
+    },
+
+    distance: function(s, t) {
+      var dx = s.x - t.x,
+          dy = s.y - t.y;
+      return Math.sqrt(dx * dx + dy * dy);
+    }
+  };
+
+  var EventQueue = {
+    list: [],
+
+    insert: function(he, site, offset) {
+      he.vertex = site;
+      he.ystar = site.y + offset;
+      for (var i=0, list=EventQueue.list, l=list.length; i<l; i++) {
+        var next = list[i];
+        if (he.ystar > next.ystar ||
+          (he.ystar == next.ystar &&
+          site.x > next.vertex.x)) {
+          continue;
+        } else {
+          break;
+        }
+      }
+      list.splice(i, 0, he);
+    },
+
+    del: function(he) {
+      for (var i=0, ls=EventQueue.list, l=ls.length; i<l && (ls[i] != he); ++i) {}
+      ls.splice(i, 1);
+    },
+
+    empty: function() { return EventQueue.list.length === 0; },
+
+    nextEvent: function(he) {
+      for (var i=0, ls=EventQueue.list, l=ls.length; i<l; ++i) {
+        if (ls[i] == he) return ls[i+1];
+      }
+      return null;
+    },
+
+    min: function() {
+      var elem = EventQueue.list[0];
+      return {
+        x: elem.vertex.x,
+        y: elem.ystar
+      };
+    },
+
+    extractMin: function() {
+      return EventQueue.list.shift();
+    }
+  };
+
+  EdgeList.init();
+  Sites.bottomSite = Sites.list.shift();
+
+  var newSite = Sites.list.shift(), newIntStar;
+  var lbnd, rbnd, llbnd, rrbnd, bisector;
+  var bot, top, temp, p, v;
+  var e, pm;
+
+  while (true) {
+    if (!EventQueue.empty()) {
+      newIntStar = EventQueue.min();
+    }
+    if (newSite && (EventQueue.empty()
+      || newSite.y < newIntStar.y
+      || (newSite.y == newIntStar.y
+      && newSite.x < newIntStar.x))) { //new site is smallest
+      lbnd = EdgeList.leftBound(newSite);
+      rbnd = EdgeList.right(lbnd);
+      bot = EdgeList.rightRegion(lbnd);
+      e = Geom.bisect(bot, newSite);
+      bisector = EdgeList.createHalfEdge(e, "l");
+      EdgeList.insert(lbnd, bisector);
+      p = Geom.intersect(lbnd, bisector);
+      if (p) {
+        EventQueue.del(lbnd);
+        EventQueue.insert(lbnd, p, Geom.distance(p, newSite));
+      }
+      lbnd = bisector;
+      bisector = EdgeList.createHalfEdge(e, "r");
+      EdgeList.insert(lbnd, bisector);
+      p = Geom.intersect(bisector, rbnd);
+      if (p) {
+        EventQueue.insert(bisector, p, Geom.distance(p, newSite));
+      }
+      newSite = Sites.list.shift();
+    } else if (!EventQueue.empty()) { //intersection is smallest
+      lbnd = EventQueue.extractMin();
+      llbnd = EdgeList.left(lbnd);
+      rbnd = EdgeList.right(lbnd);
+      rrbnd = EdgeList.right(rbnd);
+      bot = EdgeList.leftRegion(lbnd);
+      top = EdgeList.rightRegion(rbnd);
+      v = lbnd.vertex;
+      Geom.endPoint(lbnd.edge, lbnd.side, v);
+      Geom.endPoint(rbnd.edge, rbnd.side, v);
+      EdgeList.del(lbnd);
+      EventQueue.del(rbnd);
+      EdgeList.del(rbnd);
+      pm = "l";
+      if (bot.y > top.y) {
+        temp = bot;
+        bot = top;
+        top = temp;
+        pm = "r";
+      }
+      e = Geom.bisect(bot, top);
+      bisector = EdgeList.createHalfEdge(e, pm);
+      EdgeList.insert(llbnd, bisector);
+      Geom.endPoint(e, d3_voronoi_opposite[pm], v);
+      p = Geom.intersect(llbnd, bisector);
+      if (p) {
+        EventQueue.del(llbnd);
+        EventQueue.insert(llbnd, p, Geom.distance(p, bot));
+      }
+      p = Geom.intersect(bisector, rrbnd);
+      if (p) {
+        EventQueue.insert(bisector, p, Geom.distance(p, bot));
+      }
+    } else {
+      break;
+    }
+  }//end while
+
+  for (lbnd = EdgeList.right(EdgeList.leftEnd);
+      lbnd != EdgeList.rightEnd;
+      lbnd = EdgeList.right(lbnd)) {
+    callback(lbnd.edge);
+  }
+}
+/**
+* @param vertices [[x1, y1], [x2, y2], …]
+* @returns triangles [[[x1, y1], [x2, y2], [x3, y3]], …]
+ */
+d3.geom.delaunay = function(vertices) {
+  var edges = vertices.map(function() { return []; }),
+      triangles = [];
+
+  // Use the Voronoi tessellation to determine Delaunay edges.
+  d3_voronoi_tessellate(vertices, function(e) {
+    edges[e.region.l.index].push(vertices[e.region.r.index]);
+  });
+
+  // Reconnect the edges into counterclockwise triangles.
+  edges.forEach(function(edge, i) {
+    var v = vertices[i],
+        cx = v[0],
+        cy = v[1];
+    edge.forEach(function(v) {
+      v.angle = Math.atan2(v[0] - cx, v[1] - cy);
+    });
+    edge.sort(function(a, b) {
+      return a.angle - b.angle;
+    });
+    for (var j = 0, m = edge.length - 1; j < m; j++) {
+      triangles.push([v, edge[j], edge[j + 1]]);
+    }
+  });
+
+  return triangles;
+};
+// Constructs a new quadtree for the specified array of points. A quadtree is a
+// two-dimensional recursive spatial subdivision. This implementation uses
+// square partitions, dividing each square into four equally-sized squares. Each
+// point exists in a unique node; if multiple points are in the same position,
+// some points may be stored on internal nodes rather than leaf nodes. Quadtrees
+// can be used to accelerate various spatial operations, such as the Barnes-Hut
+// approximation for computing n-body forces, or collision detection.
+d3.geom.quadtree = function(points, x1, y1, x2, y2) {
+  var p,
+      i = -1,
+      n = points.length;
+
+  // Type conversion for deprecated API.
+  if (n && isNaN(points[0].x)) points = points.map(d3_geom_quadtreePoint);
+
+  // Allow bounds to be specified explicitly.
+  if (arguments.length < 5) {
+    if (arguments.length === 3) {
+      y2 = x2 = y1;
+      y1 = x1;
+    } else {
+      x1 = y1 = Infinity;
+      x2 = y2 = -Infinity;
+
+      // Compute bounds.
+      while (++i < n) {
+        p = points[i];
+        if (p.x < x1) x1 = p.x;
+        if (p.y < y1) y1 = p.y;
+        if (p.x > x2) x2 = p.x;
+        if (p.y > y2) y2 = p.y;
+      }
+
+      // Squarify the bounds.
+      var dx = x2 - x1,
+          dy = y2 - y1;
+      if (dx > dy) y2 = y1 + dx;
+      else x2 = x1 + dy;
+    }
+  }
+
+  // Recursively inserts the specified point p at the node n or one of its
+  // descendants. The bounds are defined by [x1, x2] and [y1, y2].
+  function insert(n, p, x1, y1, x2, y2) {
+    if (isNaN(p.x) || isNaN(p.y)) return; // ignore invalid points
+    if (n.leaf) {
+      var v = n.point;
+      if (v) {
+        // If the point at this leaf node is at the same position as the new
+        // point we are adding, we leave the point associated with the
+        // internal node while adding the new point to a child node. This
+        // avoids infinite recursion.
+        if ((Math.abs(v.x - p.x) + Math.abs(v.y - p.y)) < .01) {
+          insertChild(n, p, x1, y1, x2, y2);
+        } else {
+          n.point = null;
+          insertChild(n, v, x1, y1, x2, y2);
+          insertChild(n, p, x1, y1, x2, y2);
+        }
+      } else {
+        n.point = p;
+      }
+    } else {
+      insertChild(n, p, x1, y1, x2, y2);
+    }
+  }
+
+  // Recursively inserts the specified point p into a descendant of node n. The
+  // bounds are defined by [x1, x2] and [y1, y2].
+  function insertChild(n, p, x1, y1, x2, y2) {
+    // Compute the split point, and the quadrant in which to insert p.
+    var sx = (x1 + x2) * .5,
+        sy = (y1 + y2) * .5,
+        right = p.x >= sx,
+        bottom = p.y >= sy,
+        i = (bottom << 1) + right;
+
+    // Recursively insert into the child node.
+    n.leaf = false;
+    n = n.nodes[i] || (n.nodes[i] = d3_geom_quadtreeNode());
+
+    // Update the bounds as we recurse.
+    if (right) x1 = sx; else x2 = sx;
+    if (bottom) y1 = sy; else y2 = sy;
+    insert(n, p, x1, y1, x2, y2);
+  }
+
+  // Create the root node.
+  var root = d3_geom_quadtreeNode();
+
+  root.add = function(p) {
+    insert(root, p, x1, y1, x2, y2);
+  };
+
+  root.visit = function(f) {
+    d3_geom_quadtreeVisit(f, root, x1, y1, x2, y2);
+  };
+
+  // Insert all points.
+  points.forEach(root.add);
+  return root;
+};
+
+function d3_geom_quadtreeNode() {
+  return {
+    leaf: true,
+    nodes: [],
+    point: null
+  };
+}
+
+function d3_geom_quadtreeVisit(f, node, x1, y1, x2, y2) {
+  if (!f(node, x1, y1, x2, y2)) {
+    var sx = (x1 + x2) * .5,
+        sy = (y1 + y2) * .5,
+        children = node.nodes;
+    if (children[0]) d3_geom_quadtreeVisit(f, children[0], x1, y1, sx, sy);
+    if (children[1]) d3_geom_quadtreeVisit(f, children[1], sx, y1, x2, sy);
+    if (children[2]) d3_geom_quadtreeVisit(f, children[2], x1, sy, sx, y2);
+    if (children[3]) d3_geom_quadtreeVisit(f, children[3], sx, sy, x2, y2);
+  }
+}
+
+function d3_geom_quadtreePoint(p) {
+  return {
+    x: p[0],
+    y: p[1]
+  };
+}
+d3.time = {};
+
+var d3_time = Date;
+
+function d3_time_utc() {
+  this._ = new Date(arguments.length > 1
+      ? Date.UTC.apply(this, arguments)
+      : arguments[0]);
+}
+
+d3_time_utc.prototype = {
+  getDate: function() { return this._.getUTCDate(); },
+  getDay: function() { return this._.getUTCDay(); },
+  getFullYear: function() { return this._.getUTCFullYear(); },
+  getHours: function() { return this._.getUTCHours(); },
+  getMilliseconds: function() { return this._.getUTCMilliseconds(); },
+  getMinutes: function() { return this._.getUTCMinutes(); },
+  getMonth: function() { return this._.getUTCMonth(); },
+  getSeconds: function() { return this._.getUTCSeconds(); },
+  getTime: function() { return this._.getTime(); },
+  getTimezoneOffset: function() { return 0; },
+  valueOf: function() { return this._.valueOf(); },
+  setDate: function() { d3_time_prototype.setUTCDate.apply(this._, arguments); },
+  setDay: function() { d3_time_prototype.setUTCDay.apply(this._, arguments); },
+  setFullYear: function() { d3_time_prototype.setUTCFullYear.apply(this._, arguments); },
+  setHours: function() { d3_time_prototype.setUTCHours.apply(this._, arguments); },
+  setMilliseconds: function() { d3_time_prototype.setUTCMilliseconds.apply(this._, arguments); },
+  setMinutes: function() { d3_time_prototype.setUTCMinutes.apply(this._, arguments); },
+  setMonth: function() { d3_time_prototype.setUTCMonth.apply(this._, arguments); },
+  setSeconds: function() { d3_time_prototype.setUTCSeconds.apply(this._, arguments); },
+  setTime: function() { d3_time_prototype.setTime.apply(this._, arguments); }
+};
+
+var d3_time_prototype = Date.prototype;
+d3.time.format = function(template) {
+  var n = template.length;
+
+  function format(date) {
+    var string = [],
+        i = -1,
+        j = 0,
+        c,
+        f;
+    while (++i < n) {
+      if (template.charCodeAt(i) == 37) {
+        string.push(
+            template.substring(j, i),
+            (f = d3_time_formats[c = template.charAt(++i)])
+            ? f(date) : c);
+        j = i + 1;
+      }
+    }
+    string.push(template.substring(j, i));
+    return string.join("");
+  }
+
+  format.parse = function(string) {
+    var d = {y: 1900, m: 0, d: 1, H: 0, M: 0, S: 0, L: 0},
+        i = d3_time_parse(d, template, string, 0);
+    if (i != string.length) return null;
+
+    // The am-pm flag is 0 for AM, and 1 for PM.
+    if ("p" in d) d.H = d.H % 12 + d.p * 12;
+
+    var date = new d3_time();
+    date.setFullYear(d.y, d.m, d.d);
+    date.setHours(d.H, d.M, d.S, d.L);
+    return date;
+  };
+
+  format.toString = function() {
+    return template;
+  };
+
+  return format;
+};
+
+function d3_time_parse(date, template, string, j) {
+  var c,
+      p,
+      i = 0,
+      n = template.length,
+      m = string.length;
+  while (i < n) {
+    if (j >= m) return -1;
+    c = template.charCodeAt(i++);
+    if (c == 37) {
+      p = d3_time_parsers[template.charAt(i++)];
+      if (!p || ((j = p(date, string, j)) < 0)) return -1;
+    } else if (c != string.charCodeAt(j++)) {
+      return -1;
+    }
+  }
+  return j;
+}
+
+var d3_time_zfill2 = d3.format("02d"),
+    d3_time_zfill3 = d3.format("03d"),
+    d3_time_zfill4 = d3.format("04d"),
+    d3_time_sfill2 = d3.format("2d");
+
+var d3_time_formats = {
+  a: function(d) { return d3_time_weekdays[d.getDay()].substring(0, 3); },
+  A: function(d) { return d3_time_weekdays[d.getDay()]; },
+  b: function(d) { return d3_time_months[d.getMonth()].substring(0, 3); },
+  B: function(d) { return d3_time_months[d.getMonth()]; },
+  c: d3.time.format("%a %b %e %H:%M:%S %Y"),
+  d: function(d) { return d3_time_zfill2(d.getDate()); },
+  e: function(d) { return d3_time_sfill2(d.getDate()); },
+  H: function(d) { return d3_time_zfill2(d.getHours()); },
+  I: function(d) { return d3_time_zfill2(d.getHours() % 12 || 12); },
+  j: function(d) { return d3_time_zfill3(1 + d3.time.dayOfYear(d)); },
+  L: function(d) { return d3_time_zfill3(d.getMilliseconds()); },
+  m: function(d) { return d3_time_zfill2(d.getMonth() + 1); },
+  M: function(d) { return d3_time_zfill2(d.getMinutes()); },
+  p: function(d) { return d.getHours() >= 12 ? "PM" : "AM"; },
+  S: function(d) { return d3_time_zfill2(d.getSeconds()); },
+  U: function(d) { return d3_time_zfill2(d3.time.sundayOfYear(d)); },
+  w: function(d) { return d.getDay(); },
+  W: function(d) { return d3_time_zfill2(d3.time.mondayOfYear(d)); },
+  x: d3.time.format("%m/%d/%y"),
+  X: d3.time.format("%H:%M:%S"),
+  y: function(d) { return d3_time_zfill2(d.getFullYear() % 100); },
+  Y: function(d) { return d3_time_zfill4(d.getFullYear() % 10000); },
+  Z: d3_time_zone,
+  "%": function(d) { return "%"; }
+};
+
+var d3_time_parsers = {
+  a: d3_time_parseWeekdayAbbrev,
+  A: d3_time_parseWeekday,
+  b: d3_time_parseMonthAbbrev,
+  B: d3_time_parseMonth,
+  c: d3_time_parseLocaleFull,
+  d: d3_time_parseDay,
+  e: d3_time_parseDay,
+  H: d3_time_parseHour24,
+  I: d3_time_parseHour24,
+  // j: function(d, s, i) { /*TODO day of year [001,366] */ return i; },
+  L: d3_time_parseMilliseconds,
+  m: d3_time_parseMonthNumber,
+  M: d3_time_parseMinutes,
+  p: d3_time_parseAmPm,
+  S: d3_time_parseSeconds,
+  // U: function(d, s, i) { /*TODO week number (sunday) [00,53] */ return i; },
+  // w: function(d, s, i) { /*TODO weekday [0,6] */ return i; },
+  // W: function(d, s, i) { /*TODO week number (monday) [00,53] */ return i; },
+  x: d3_time_parseLocaleDate,
+  X: d3_time_parseLocaleTime,
+  y: d3_time_parseYear,
+  Y: d3_time_parseFullYear
+  // ,
+  // Z: function(d, s, i) { /*TODO time zone */ return i; },
+  // "%": function(d, s, i) { /*TODO literal % */ return i; }
+};
+
+// Note: weekday is validated, but does not set the date.
+function d3_time_parseWeekdayAbbrev(date, string, i) {
+  return d3_time_weekdayAbbrevRe.test(string.substring(i, i += 3)) ? i : -1;
+}
+
+// Note: weekday is validated, but does not set the date.
+function d3_time_parseWeekday(date, string, i) {
+  d3_time_weekdayRe.lastIndex = 0;
+  var n = d3_time_weekdayRe.exec(string.substring(i, i + 10));
+  return n ? i += n[0].length : -1;
+}
+
+var d3_time_weekdayAbbrevRe = /^(?:sun|mon|tue|wed|thu|fri|sat)/i,
+    d3_time_weekdayRe = /^(?:Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday)/i;
+    d3_time_weekdays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
+
+function d3_time_parseMonthAbbrev(date, string, i) {
+  var n = d3_time_monthAbbrevLookup.get(string.substring(i, i += 3).toLowerCase());
+  return n == null ? -1 : (date.m = n, i);
+}
+
+var d3_time_monthAbbrevLookup = d3.map({
+  jan: 0,
+  feb: 1,
+  mar: 2,
+  apr: 3,
+  may: 4,
+  jun: 5,
+  jul: 6,
+  aug: 7,
+  sep: 8,
+  oct: 9,
+  nov: 10,
+  dec: 11
+});
+
+function d3_time_parseMonth(date, string, i) {
+  d3_time_monthRe.lastIndex = 0;
+  var n = d3_time_monthRe.exec(string.substring(i, i + 12));
+  return n ? (date.m = d3_time_monthLookup.get(n[0].toLowerCase()), i += n[0].length) : -1;
+}
+
+var d3_time_monthRe = /^(?:January|February|March|April|May|June|July|August|September|October|November|December)/ig;
+
+var d3_time_monthLookup = d3.map({
+  january: 0,
+  february: 1,
+  march: 2,
+  april: 3,
+  may: 4,
+  june: 5,
+  july: 6,
+  august: 7,
+  september: 8,
+  october: 9,
+  november: 10,
+  december: 11
+});
+
+var d3_time_months = [
+  "January",
+  "February",
+  "March",
+  "April",
+  "May",
+  "June",
+  "July",
+  "August",
+  "September",
+  "October",
+  "November",
+  "December"
+];
+
+function d3_time_parseLocaleFull(date, string, i) {
+  return d3_time_parse(date, d3_time_formats.c.toString(), string, i);
+}
+
+function d3_time_parseLocaleDate(date, string, i) {
+  return d3_time_parse(date, d3_time_formats.x.toString(), string, i);
+}
+
+function d3_time_parseLocaleTime(date, string, i) {
+  return d3_time_parse(date, d3_time_formats.X.toString(), string, i);
+}
+
+function d3_time_parseFullYear(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 4));
+  return n ? (date.y = +n[0], i += n[0].length) : -1;
+}
+
+function d3_time_parseYear(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
+  return n ? (date.y = d3_time_century() + +n[0], i += n[0].length) : -1;
+}
+
+function d3_time_century() {
+  return ~~(new Date().getFullYear() / 1000) * 1000;
+}
+
+function d3_time_parseMonthNumber(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
+  return n ? (date.m = n[0] - 1, i += n[0].length) : -1;
+}
+
+function d3_time_parseDay(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
+  return n ? (date.d = +n[0], i += n[0].length) : -1;
+}
+
+// Note: we don't validate that the hour is in the range [0,23] or [1,12].
+function d3_time_parseHour24(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
+  return n ? (date.H = +n[0], i += n[0].length) : -1;
+}
+
+function d3_time_parseMinutes(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
+  return n ? (date.M = +n[0], i += n[0].length) : -1;
+}
+
+function d3_time_parseSeconds(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
+  return n ? (date.S = +n[0], i += n[0].length) : -1;
+}
+
+function d3_time_parseMilliseconds(date, string, i) {
+  d3_time_numberRe.lastIndex = 0;
+  var n = d3_time_numberRe.exec(string.substring(i, i + 3));
+  return n ? (date.L = +n[0], i += n[0].length) : -1;
+}
+
+// Note: we don't look at the next directive.
+var d3_time_numberRe = /\s*\d+/;
+
+function d3_time_parseAmPm(date, string, i) {
+  var n = d3_time_amPmLookup.get(string.substring(i, i += 2).toLowerCase());
+  return n == null ? -1 : (date.p = n, i);
+}
+
+var d3_time_amPmLookup = d3.map({
+  am: 0,
+  pm: 1
+});
+
+// TODO table of time zone offset names?
+function d3_time_zone(d) {
+  var z = d.getTimezoneOffset(),
+      zs = z > 0 ? "-" : "+",
+      zh = ~~(Math.abs(z) / 60),
+      zm = Math.abs(z) % 60;
+  return zs + d3_time_zfill2(zh) + d3_time_zfill2(zm);
+}
+d3.time.format.utc = function(template) {
+  var local = d3.time.format(template);
+
+  function format(date) {
+    try {
+      d3_time = d3_time_utc;
+      var utc = new d3_time();
+      utc._ = date;
+      return local(utc);
+    } finally {
+      d3_time = Date;
+    }
+  }
+
+  format.parse = function(string) {
+    try {
+      d3_time = d3_time_utc;
+      var date = local.parse(string);
+      return date && date._;
+    } finally {
+      d3_time = Date;
+    }
+  };
+
+  format.toString = local.toString;
+
+  return format;
+};
+var d3_time_formatIso = d3.time.format.utc("%Y-%m-%dT%H:%M:%S.%LZ");
+
+d3.time.format.iso = Date.prototype.toISOString ? d3_time_formatIsoNative : d3_time_formatIso;
+
+function d3_time_formatIsoNative(date) {
+  return date.toISOString();
+}
+
+d3_time_formatIsoNative.parse = function(string) {
+  return new Date(string);
+};
+
+d3_time_formatIsoNative.toString = d3_time_formatIso.toString;
+function d3_time_interval(local, step, number) {
+
+  function round(date) {
+    var d0 = local(date), d1 = offset(d0, 1);
+    return date - d0 < d1 - date ? d0 : d1;
+  }
+
+  function ceil(date) {
+    step(date = local(new d3_time(date - 1)), 1);
+    return date;
+  }
+
+  function offset(date, k) {
+    step(date = new d3_time(+date), k);
+    return date;
+  }
+
+  function range(t0, t1, dt) {
+    var time = ceil(t0), times = [];
+    if (dt > 1) {
+      while (time < t1) {
+        if (!(number(time) % dt)) times.push(new Date(+time));
+        step(time, 1);
+      }
+    } else {
+      while (time < t1) times.push(new Date(+time)), step(time, 1);
+    }
+    return times;
+  }
+
+  function range_utc(t0, t1, dt) {
+    try {
+      d3_time = d3_time_utc;
+      var utc = new d3_time_utc();
+      utc._ = t0;
+      return range(utc, t1, dt);
+    } finally {
+      d3_time = Date;
+    }
+  }
+
+  local.floor = local;
+  local.round = round;
+  local.ceil = ceil;
+  local.offset = offset;
+  local.range = range;
+
+  var utc = local.utc = d3_time_interval_utc(local);
+  utc.floor = utc;
+  utc.round = d3_time_interval_utc(round);
+  utc.ceil = d3_time_interval_utc(ceil);
+  utc.offset = d3_time_interval_utc(offset);
+  utc.range = range_utc;
+
+  return local;
+}
+
+function d3_time_interval_utc(method) {
+  return function(date, k) {
+    try {
+      d3_time = d3_time_utc;
+      var utc = new d3_time_utc();
+      utc._ = date;
+      return method(utc, k)._;
+    } finally {
+      d3_time = Date;
+    }
+  };
+}
+d3.time.second = d3_time_interval(function(date) {
+  return new d3_time(Math.floor(date / 1e3) * 1e3);
+}, function(date, offset) {
+  date.setTime(date.getTime() + Math.floor(offset) * 1e3); // DST breaks setSeconds
+}, function(date) {
+  return date.getSeconds();
+});
+
+d3.time.seconds = d3.time.second.range;
+d3.time.seconds.utc = d3.time.second.utc.range;
+d3.time.minute = d3_time_interval(function(date) {
+  return new d3_time(Math.floor(date / 6e4) * 6e4);
+}, function(date, offset) {
+  date.setTime(date.getTime() + Math.floor(offset) * 6e4); // DST breaks setMinutes
+}, function(date) {
+  return date.getMinutes();
+});
+
+d3.time.minutes = d3.time.minute.range;
+d3.time.minutes.utc = d3.time.minute.utc.range;
+d3.time.hour = d3_time_interval(function(date) {
+  var timezone = date.getTimezoneOffset() / 60;
+  return new d3_time((Math.floor(date / 36e5 - timezone) + timezone) * 36e5);
+}, function(date, offset) {
+  date.setTime(date.getTime() + Math.floor(offset) * 36e5); // DST breaks setHours
+}, function(date) {
+  return date.getHours();
+});
+
+d3.time.hours = d3.time.hour.range;
+d3.time.hours.utc = d3.time.hour.utc.range;
+d3.time.day = d3_time_interval(function(date) {
+  return new d3_time(date.getFullYear(), date.getMonth(), date.getDate());
+}, function(date, offset) {
+  date.setDate(date.getDate() + offset);
+}, function(date) {
+  return date.getDate() - 1;
+});
+
+d3.time.days = d3.time.day.range;
+d3.time.days.utc = d3.time.day.utc.range;
+
+d3.time.dayOfYear = function(date) {
+  var year = d3.time.year(date);
+  return Math.floor((date - year) / 864e5 - (date.getTimezoneOffset() - year.getTimezoneOffset()) / 1440);
+};
+d3_time_weekdays.forEach(function(day, i) {
+  day = day.toLowerCase();
+  i = 7 - i;
+
+  var interval = d3.time[day] = d3_time_interval(function(date) {
+    (date = d3.time.day(date)).setDate(date.getDate() - (date.getDay() + i) % 7);
+    return date;
+  }, function(date, offset) {
+    date.setDate(date.getDate() + Math.floor(offset) * 7);
+  }, function(date) {
+    var day = d3.time.year(date).getDay();
+    return Math.floor((d3.time.dayOfYear(date) + (day + i) % 7) / 7) - (day !== i);
+  });
+
+  d3.time[day + "s"] = interval.range;
+  d3.time[day + "s"].utc = interval.utc.range;
+
+  d3.time[day + "OfYear"] = function(date) {
+    var day = d3.time.year(date).getDay();
+    return Math.floor((d3.time.dayOfYear(date) + (day + i) % 7) / 7);
+  };
+});
+
+d3.time.week = d3.time.sunday;
+d3.time.weeks = d3.time.sunday.range;
+d3.time.weeks.utc = d3.time.sunday.utc.range;
+d3.time.weekOfYear = d3.time.sundayOfYear;
+d3.time.month = d3_time_interval(function(date) {
+  return new d3_time(date.getFullYear(), date.getMonth(), 1);
+}, function(date, offset) {
+  date.setMonth(date.getMonth() + offset);
+}, function(date) {
+  return date.getMonth();
+});
+
+d3.time.months = d3.time.month.range;
+d3.time.months.utc = d3.time.month.utc.range;
+d3.time.year = d3_time_interval(function(date) {
+  return new d3_time(date.getFullYear(), 0, 1);
+}, function(date, offset) {
+  date.setFullYear(date.getFullYear() + offset);
+}, function(date) {
+  return date.getFullYear();
+});
+
+d3.time.years = d3.time.year.range;
+d3.time.years.utc = d3.time.year.utc.range;
+function d3_time_scale(linear, methods, format) {
+
+  function scale(x) {
+    return linear(x);
+  }
+
+  scale.invert = function(x) {
+    return d3_time_scaleDate(linear.invert(x));
+  };
+
+  scale.domain = function(x) {
+    if (!arguments.length) return linear.domain().map(d3_time_scaleDate);
+    linear.domain(x);
+    return scale;
+  };
+
+  scale.nice = function(m) {
+    var extent = d3_time_scaleExtent(scale.domain());
+    return scale.domain([m.floor(extent[0]), m.ceil(extent[1])]);
+  };
+
+  scale.ticks = function(m, k) {
+    var extent = d3_time_scaleExtent(scale.domain());
+    if (typeof m !== "function") {
+      var span = extent[1] - extent[0],
+          target = span / m,
+          i = d3.bisect(d3_time_scaleSteps, target);
+      if (i == d3_time_scaleSteps.length) return methods.year(extent, m);
+      if (!i) return linear.ticks(m).map(d3_time_scaleDate);
+      if (Math.log(target / d3_time_scaleSteps[i - 1]) < Math.log(d3_time_scaleSteps[i] / target)) --i;
+      m = methods[i];
+      k = m[1];
+      m = m[0].range;
+    }
+    return m(extent[0], new Date(+extent[1] + 1), k); // inclusive upper bound
+  };
+
+  scale.tickFormat = function() {
+    return format;
+  };
+
+  scale.copy = function() {
+    return d3_time_scale(linear.copy(), methods, format);
+  };
+
+  // TOOD expose d3_scale_linear_rebind?
+  return d3.rebind(scale, linear, "range", "rangeRound", "interpolate", "clamp");
+}
+
+// TODO expose d3_scaleExtent?
+function d3_time_scaleExtent(domain) {
+  var start = domain[0], stop = domain[domain.length - 1];
+  return start < stop ? [start, stop] : [stop, start];
+}
+
+function d3_time_scaleDate(t) {
+  return new Date(t);
+}
+
+function d3_time_scaleFormat(formats) {
+  return function(date) {
+    var i = formats.length - 1, f = formats[i];
+    while (!f[1](date)) f = formats[--i];
+    return f[0](date);
+  };
+}
+
+function d3_time_scaleSetYear(y) {
+  var d = new Date(y, 0, 1);
+  d.setFullYear(y); // Y2K fail
+  return d;
+}
+
+function d3_time_scaleGetYear(d) {
+  var y = d.getFullYear(),
+      d0 = d3_time_scaleSetYear(y),
+      d1 = d3_time_scaleSetYear(y + 1);
+  return y + (d - d0) / (d1 - d0);
+}
+
+var d3_time_scaleSteps = [
+  1e3,    // 1-second
+  5e3,    // 5-second
+  15e3,   // 15-second
+  3e4,    // 30-second
+  6e4,    // 1-minute
+  3e5,    // 5-minute
+  9e5,    // 15-minute
+  18e5,   // 30-minute
+  36e5,   // 1-hour
+  108e5,  // 3-hour
+  216e5,  // 6-hour
+  432e5,  // 12-hour
+  864e5,  // 1-day
+  1728e5, // 2-day
+  6048e5, // 1-week
+  2592e6, // 1-month
+  7776e6, // 3-month
+  31536e6 // 1-year
+];
+
+var d3_time_scaleLocalMethods = [
+  [d3.time.second, 1],
+  [d3.time.second, 5],
+  [d3.time.second, 15],
+  [d3.time.second, 30],
+  [d3.time.minute, 1],
+  [d3.time.minute, 5],
+  [d3.time.minute, 15],
+  [d3.time.minute, 30],
+  [d3.time.hour, 1],
+  [d3.time.hour, 3],
+  [d3.time.hour, 6],
+  [d3.time.hour, 12],
+  [d3.time.day, 1],
+  [d3.time.day, 2],
+  [d3.time.week, 1],
+  [d3.time.month, 1],
+  [d3.time.month, 3],
+  [d3.time.year, 1]
+];
+
+var d3_time_scaleLocalFormats = [
+  [d3.time.format("%Y"), function(d) { return true; }],
+  [d3.time.format("%B"), function(d) { return d.getMonth(); }],
+  [d3.time.format("%b %d"), function(d) { return d.getDate() != 1; }],
+  [d3.time.format("%a %d"), function(d) { return d.getDay() && d.getDate() != 1; }],
+  [d3.time.format("%I %p"), function(d) { return d.getHours(); }],
+  [d3.time.format("%I:%M"), function(d) { return d.getMinutes(); }],
+  [d3.time.format(":%S"), function(d) { return d.getSeconds(); }],
+  [d3.time.format(".%L"), function(d) { return d.getMilliseconds(); }]
+];
+
+var d3_time_scaleLinear = d3.scale.linear(),
+    d3_time_scaleLocalFormat = d3_time_scaleFormat(d3_time_scaleLocalFormats);
+
+d3_time_scaleLocalMethods.year = function(extent, m) {
+  return d3_time_scaleLinear.domain(extent.map(d3_time_scaleGetYear)).ticks(m).map(d3_time_scaleSetYear);
+};
+
+d3.time.scale = function() {
+  return d3_time_scale(d3.scale.linear(), d3_time_scaleLocalMethods, d3_time_scaleLocalFormat);
+};
+var d3_time_scaleUTCMethods = d3_time_scaleLocalMethods.map(function(m) {
+  return [m[0].utc, m[1]];
+});
+
+var d3_time_scaleUTCFormats = [
+  [d3.time.format.utc("%Y"), function(d) { return true; }],
+  [d3.time.format.utc("%B"), function(d) { return d.getUTCMonth(); }],
+  [d3.time.format.utc("%b %d"), function(d) { return d.getUTCDate() != 1; }],
+  [d3.time.format.utc("%a %d"), function(d) { return d.getUTCDay() && d.getUTCDate() != 1; }],
+  [d3.time.format.utc("%I %p"), function(d) { return d.getUTCHours(); }],
+  [d3.time.format.utc("%I:%M"), function(d) { return d.getUTCMinutes(); }],
+  [d3.time.format.utc(":%S"), function(d) { return d.getUTCSeconds(); }],
+  [d3.time.format.utc(".%L"), function(d) { return d.getUTCMilliseconds(); }]
+];
+
+var d3_time_scaleUTCFormat = d3_time_scaleFormat(d3_time_scaleUTCFormats);
+
+function d3_time_scaleUTCSetYear(y) {
+  var d = new Date(Date.UTC(y, 0, 1));
+  d.setUTCFullYear(y); // Y2K fail
+  return d;
+}
+
+function d3_time_scaleUTCGetYear(d) {
+  var y = d.getUTCFullYear(),
+      d0 = d3_time_scaleUTCSetYear(y),
+      d1 = d3_time_scaleUTCSetYear(y + 1);
+  return y + (d - d0) / (d1 - d0);
+}
+
+d3_time_scaleUTCMethods.year = function(extent, m) {
+  return d3_time_scaleLinear.domain(extent.map(d3_time_scaleUTCGetYear)).ticks(m).map(d3_time_scaleUTCSetYear);
+};
+
+d3.time.scale.utc = function() {
+  return d3_time_scale(d3.scale.linear(), d3_time_scaleUTCMethods, d3_time_scaleUTCFormat);
+};
+})();
diff --git a/visualize/static/d3.v2.min.js b/visualize/static/d3.v2.min.js
new file mode 100644
index 00000000..dddd929c
--- /dev/null
+++ b/visualize/static/d3.v2.min.js
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