diff --git a/Makefile b/Makefile
index 7aac1ebf..ec745de5 100644
--- a/Makefile
+++ b/Makefile
@@ -35,8 +35,10 @@ d3.core.js: \
 	src/core/descending.js \
 	src/core/merge.js \
 	src/core/split.js \
+	src/core/collapse.js \
 	src/core/call.js \
 	src/core/range.js \
+	src/core/requote.js \
 	src/core/text.js \
 	src/core/json.js \
 	src/core/ns.js \
diff --git a/d3.js b/d3.js
index 9faf991c..cc473863 100644
--- a/d3.js
+++ b/d3.js
@@ -1,4 +1,4 @@
-d3 = {version: "0.26.1"}; // semver
+d3 = {version: "0.27.0"}; // semver
 if (!Date.now) Date.now = function() {
   return +new Date();
 };
@@ -44,6 +44,9 @@ d3["split"] = function(array, f) {
 function d3_splitter(d) {
   return d == null;
 }
+function d3_collapse(s) {
+  return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
+}
 function d3_call(callback, var_args) {
   var_args = d3_array(arguments);
   var_args[0] = this;
@@ -66,6 +69,11 @@ d3.range = function(start, stop, step) {
   else while ((j = start + step * ++i) < stop) range.push(j);
   return range;
 };
+d3["requote"] = function(s) {
+  return s.replace(d3_requote_re, "\\$&");
+};
+
+var d3_requote_re = /[\\\^\$\*\+\?\[\]\(\)\.\{\}]/g;
 d3.text = function(url, mime, callback) {
   var req = new XMLHttpRequest();
   if (arguments.length == 3) req.overrideMimeType(mime);
@@ -1057,6 +1065,43 @@ function d3_selection(groups) {
         : (name.local ? attrConstantNS : attrConstant)));
   };
 
+  groups["classed"] = function(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) {
+      return first(function() {
+        return re.test(this.className);
+      });
+    }
+
+    /** @this {Element} */
+    function classedAdd() {
+      var classes = this.className;
+      if (!re.test(classes)) {
+        this.className = d3_collapse(classes + " " + name);
+      }
+    }
+
+    /** @this {Element} */
+    function classedRemove() {
+      var classes = d3_collapse(this.className.replace(re, " "));
+      this.className = classes.length ? classes : null;
+    }
+
+    /** @this {Element} */
+    function classedFunction() {
+      (value.apply(this, arguments)
+          ? classedAdd
+          : classedRemove).call(this);
+    }
+
+    return groups.each(typeof value == "function"
+        ? classedFunction : value
+        ? classedAdd
+        : classedRemove);
+  };
+
   groups.style = function(name, value, priority) {
     if (arguments.length < 3) priority = null;
 
@@ -1203,7 +1248,7 @@ function d3_selection(groups) {
   };
 
   groups.sort = function(comparator) {
-    comparator = d3_comparator.apply(this, arguments);
+    comparator = d3_selection_comparator.apply(this, arguments);
     for (var j = 0, m = groups.length; j < m; j++) {
       var group = groups[j];
       group.sort(comparator);
@@ -1253,20 +1298,12 @@ function d3_selection_join(key) {
   };
 }
 
-function d3_comparator(comparator) {
-  if (!arguments.length) comparator = d3_ascending;
+function d3_selection_comparator(comparator) {
+  if (!arguments.length) comparator = d3.ascending;
   return function(a, b) {
     return comparator(a && a.__data__, b && b.__data__);
   };
 }
-
-function d3_ascending(a, b) {
-  return a < b ? -1 : a > b ? 1 : 0;
-}
-
-function d3_descending(a, b) {
-  return a < b ? 1 : a > b ? -1 : 0;
-}
 d3.transition = d3_root.transition;
 
 var d3_transitionId = 0,
diff --git a/d3.min.js b/d3.min.js
index 503f2434..d9e8708b 100644
--- a/d3.min.js
+++ b/d3.min.js
@@ -1,61 +1,63 @@
-(function(){var o=null;d3={version:"0.26.1"};if(!Date.now)Date.now=function(){return+new Date};if(!Object.create)Object.create=function(a){function b(){}b.prototype=a;return new b};function x(a){return Array.prototype.slice.call(a)}function y(a){return typeof a=="function"?a:function(){return a}}d3.ascending=function(a,b){return a<b?-1:a>b?1:0};d3.descending=function(a,b){return b<a?-1:b>a?1:0};d3.merge=function(a){return Array.prototype.concat.apply([],a)};
-d3.split=function(a,b){var e=[],f=[],c,d=-1,h=a.length;if(arguments.length<2)b=aa;for(;++d<h;)if(b.call(f,c=a[d],d)){e.push(f);f=[]}else f.push(c);e.push(f);return e};function aa(a){return a==o}function E(a,b){b=x(arguments);b[0]=this;a.apply(this,b);return this}d3.range=function(a,b,e){if(arguments.length==1){b=a;a=0}if(e==o)e=1;if((b-a)/e==Infinity)throw Error("infinite range");var f=[],c=-1,d;if(e<0)for(;(d=a+e*++c)>b;)f.push(d);else for(;(d=a+e*++c)<b;)f.push(d);return f};
+(function(){var o=null;d3={version:"0.27.0"};if(!Date.now)Date.now=function(){return+new Date};if(!Object.create)Object.create=function(a){function b(){}b.prototype=a;return new b};function x(a){return Array.prototype.slice.call(a)}function y(a){return typeof a=="function"?a:function(){return a}}d3.ascending=function(a,b){return a<b?-1:a>b?1:0};d3.descending=function(a,b){return b<a?-1:b>a?1:0};d3.merge=function(a){return Array.prototype.concat.apply([],a)};
+d3.split=function(a,b){var e=[],f=[],c,d=-1,h=a.length;if(arguments.length<2)b=aa;for(;++d<h;)if(b.call(f,c=a[d],d)){e.push(f);f=[]}else f.push(c);e.push(f);return e};function aa(a){return a==o}function E(a){return a.replace(/(^\s+)|(\s+$)/g,"").replace(/\s+/g," ")}function ba(a,b){b=x(arguments);b[0]=this;a.apply(this,b);return this}
+d3.range=function(a,b,e){if(arguments.length==1){b=a;a=0}if(e==o)e=1;if((b-a)/e==Infinity)throw Error("infinite range");var f=[],c=-1,d;if(e<0)for(;(d=a+e*++c)>b;)f.push(d);else for(;(d=a+e*++c)<b;)f.push(d);return f};d3.requote=function(a){return a.replace(ca,"\\$&")};var ca=/[\\\^\$\*\+\?\[\]\(\)\.\{\}]/g;
 d3.text=function(a,b,e){var f=new XMLHttpRequest;if(arguments.length==3)f.overrideMimeType(b);else e=b;f.open("GET",a,true);f.onreadystatechange=function(){if(f.readyState==4)e(f.status<300&&f.responseText?f.responseText:o)};f.send(o)};d3.json=function(a,b){return d3.text(a,"application/json",function(e){b(e&&JSON.parse(e))})};
-d3.ns={prefix:{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/"},qualify:function(a){var b=a.indexOf(":");return b<0?a:{space:d3.ns.prefix[a.substring(0,b)],local:a.substring(b+1)}}};d3.dispatch=function(){for(var a={},b,e=0,f=arguments.length;e<f;e++){b=arguments[e];a[b]=ba(b)}return a};
-function ba(){var a={},b=[];a.add=function(e){for(var f=0;f<b.length;f++)if(b[f].i==e)return a;b.push({i:e,on:true});return a};a.remove=function(e){for(var f=0;f<b.length;f++){var c=b[f];if(c.i==e){c.on=false;b=b.slice(0,f).concat(b.slice(f+1));break}}return a};a.dispatch=function(){for(var e=b,f=0,c=e.length;f<c;f++){var d=e[f];d.on&&d.i.apply(this,arguments)}};return a}
-d3.format=function(a){a=ca.exec(a);var b=a[1]||" ",e=a[5],f=+a[6],c=a[7],d=a[8],h=a[9];if(d)d=d.substring(1);if(e)b="0";if(h=="d")d="0";return function(g){if(h=="d"&&g%1)return"";if(d)g=(+g).toFixed(d);else g+="";if(c){for(var i=g.lastIndexOf("."),j=i>=0?g.substring(i):(i=g.length,""),m=[];i>0;)m.push(g.substring(i-=3,i+3));g=m.reverse().join(",")+j}i=g.length;if(i<f)g=Array(f-i+1).join(b)+g;return g}};
-var ca=/(?:([^{])?([<>=^]))?([+\- ])?(#)?(0)?([0-9]+)?(,)?(\.[0-9]+)?([a-zA-Z%])?/,da=F(2),ea=F(3),ma={linear:function(){return fa},poly:F,quad:function(){return da},cubic:function(){return ea},sin:function(){return ga},exp:function(){return ha},circle:function(){return ia},elastic:ja,back:ka,bounce:function(){return la}},pa={"in":function(a){return a},out:na,"in-out":oa,"out-in":function(a){return oa(na(a))}};
-d3.ease=function(a){var b=a.indexOf("-");return pa[b>=0?a.substring(b+1):"in"](ma[b>=0?a.substring(0,b):a].apply(o,Array.prototype.slice.call(arguments,1)))};function na(a){return function(b){return 1-a(1-b)}}function oa(a){return function(b){return 0.5*(b<0.5?a(2*b):2-a(2-2*b))}}function fa(a){return a}function F(a){return function(b){return Math.pow(b,a)}}function ga(a){return 1-Math.cos(a*Math.PI/2)}function ha(a){return a?Math.pow(2,10*(a-1))-0.0010:0}
-function ia(a){return 1-Math.sqrt(1-a*a)}function ja(a,b){var e;if(arguments.length<2)b=0.45;if(arguments.length<1){a=1;e=b/4}else e=b/(2*Math.PI)*Math.asin(1/a);return function(f){return 1+a*Math.pow(2,10*-f)*Math.sin((f-e)*2*Math.PI/b)}}function ka(a){a||(a=1.70158);return function(b){return b*b*((a+1)*b-a)}}function la(a){return a<1/2.75?7.5625*a*a:a<2/2.75?7.5625*(a-=1.5/2.75)*a+0.75:a<2.5/2.75?7.5625*(a-=2.25/2.75)*a+0.9375:7.5625*(a-=2.625/2.75)*a+0.984375}d3.event=o;
+d3.ns={prefix:{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/"},qualify:function(a){var b=a.indexOf(":");return b<0?a:{space:d3.ns.prefix[a.substring(0,b)],local:a.substring(b+1)}}};d3.dispatch=function(){for(var a={},b,e=0,f=arguments.length;e<f;e++){b=arguments[e];a[b]=da(b)}return a};
+function da(){var a={},b=[];a.add=function(e){for(var f=0;f<b.length;f++)if(b[f].i==e)return a;b.push({i:e,on:true});return a};a.remove=function(e){for(var f=0;f<b.length;f++){var c=b[f];if(c.i==e){c.on=false;b=b.slice(0,f).concat(b.slice(f+1));break}}return a};a.dispatch=function(){for(var e=b,f=0,c=e.length;f<c;f++){var d=e[f];d.on&&d.i.apply(this,arguments)}};return a}
+d3.format=function(a){a=ea.exec(a);var b=a[1]||" ",e=a[5],f=+a[6],c=a[7],d=a[8],h=a[9];if(d)d=d.substring(1);if(e)b="0";if(h=="d")d="0";return function(g){if(h=="d"&&g%1)return"";if(d)g=(+g).toFixed(d);else g+="";if(c){for(var i=g.lastIndexOf("."),j=i>=0?g.substring(i):(i=g.length,""),l=[];i>0;)l.push(g.substring(i-=3,i+3));g=l.reverse().join(",")+j}i=g.length;if(i<f)g=Array(f-i+1).join(b)+g;return g}};
+var ea=/(?:([^{])?([<>=^]))?([+\- ])?(#)?(0)?([0-9]+)?(,)?(\.[0-9]+)?([a-zA-Z%])?/,fa=F(2),ga=F(3),oa={linear:function(){return ha},poly:F,quad:function(){return fa},cubic:function(){return ga},sin:function(){return ia},exp:function(){return ja},circle:function(){return ka},elastic:la,back:ma,bounce:function(){return na}},ra={"in":function(a){return a},out:pa,"in-out":qa,"out-in":function(a){return qa(pa(a))}};
+d3.ease=function(a){var b=a.indexOf("-");return ra[b>=0?a.substring(b+1):"in"](oa[b>=0?a.substring(0,b):a].apply(o,Array.prototype.slice.call(arguments,1)))};function pa(a){return function(b){return 1-a(1-b)}}function qa(a){return function(b){return 0.5*(b<0.5?a(2*b):2-a(2-2*b))}}function ha(a){return a}function F(a){return function(b){return Math.pow(b,a)}}function ia(a){return 1-Math.cos(a*Math.PI/2)}function ja(a){return a?Math.pow(2,10*(a-1))-0.0010:0}
+function ka(a){return 1-Math.sqrt(1-a*a)}function la(a,b){var e;if(arguments.length<2)b=0.45;if(arguments.length<1){a=1;e=b/4}else e=b/(2*Math.PI)*Math.asin(1/a);return function(f){return 1+a*Math.pow(2,10*-f)*Math.sin((f-e)*2*Math.PI/b)}}function ma(a){a||(a=1.70158);return function(b){return b*b*((a+1)*b-a)}}function na(a){return a<1/2.75?7.5625*a*a:a<2/2.75?7.5625*(a-=1.5/2.75)*a+0.75:a<2.5/2.75?7.5625*(a-=2.25/2.75)*a+0.9375:7.5625*(a-=2.625/2.75)*a+0.984375}d3.event=o;
 d3.interpolate=function(a,b){if(typeof b=="number")return d3.interpolateNumber(+a,b);if(typeof b=="string")return b in G||/^(#|rgb\(|hsl\()/.test(b)?d3.interpolateRgb(String(a),b):d3.interpolateString(String(a),b);if(b instanceof Array)return d3.interpolateArray(a,b);return d3.interpolateObject(a,b)};d3.interpolateNumber=function(a,b){b-=a;return function(e){return a+b*e}};
 d3.interpolateString=function(a,b){var e,f,c=0,d=[],h=[],g,i;for(f=0;e=H.exec(b);++f){e.index&&d.push(b.substring(c,e.index));h.push({a:d.length,x:e[0]});d.push(o);c=H.lastIndex}c<b.length&&d.push(b.substring(c));f=0;for(g=h.length;(e=H.exec(a))&&f<g;++f){i=h[f];if(i.x==e[0]){if(i.a)if(d[i.a+1]==o){d[i.a-1]+=i.x;d.splice(i.a,1);for(e=f+1;e<g;++e)h[e].a--}else{d[i.a-1]+=i.x+d[i.a+1];d.splice(i.a,2);for(e=f+1;e<g;++e)h[e].a-=2}else if(d[i.a+1]==o)d[i.a]=i.x;else{d[i.a]=i.x+d[i.a+1];d.splice(i.a+1,1);
 for(e=f+1;e<g;++e)h[e].a--}h.splice(f,1);g--;f--}else i.x=d3.interpolateNumber(parseFloat(e[0]),parseFloat(i.x))}for(;f<g;){i=h.pop();if(d[i.a+1]==o)d[i.a]=i.x;else{d[i.a]=i.x+d[i.a+1];d.splice(i.a+1,1)}g--}if(d.length==1)return d[0]==o?h[0].x:function(){return b};return function(j){for(f=0;f<g;++f)d[(i=h[f]).a]=i.x(j);return d.join("")}};
 d3.interpolateRgb=function(a,b){a=d3.rgb(a);b=d3.rgb(b);var e=a.r,f=a.g,c=a.b,d=b.r-e,h=b.g-f,g=b.b-c;return function(i){return"rgb("+Math.round(e+d*i)+","+Math.round(f+h*i)+","+Math.round(c+g*i)+")"}};d3.interpolateArray=function(a,b){var e=[],f=[],c=a.length,d=b.length,h=Math.min(a.length,b.length),g;for(g=0;g<h;++g)e.push(d3.interpolate(a[g],b[g]));for(;g<c;++g)f[g]=a[g];for(;g<d;++g)f[g]=b[g];return function(i){for(g=0;g<h;++g)f[g]=e[g](i);return f}};
-d3.interpolateObject=function(a,b){var e={},f={},c;for(c in a)if(c in b)e[c]=(c in qa||/\bcolor\b/.test(c)?d3.interpolateRgb:d3.interpolate)(a[c],b[c]);else f[c]=a[c];for(c in b)c in a||(f[c]=b[c]);return function(d){for(c in e)f[c]=e[c](d);return f}};var H=/[-+]?(?:\d+\.\d+|\d+\.|\.\d+|\d+)(?:[eE][-]?\d+)?/g,qa={background:1,fill:1,stroke:1};d3.rgb=function(a,b,e){return arguments.length==1?I(""+a,J,ra):J(~~a,~~b,~~e)};function J(a,b,e){return{r:a,g:b,b:e,toString:sa}}
-function sa(){return"#"+K(this.r)+K(this.g)+K(this.b)}function K(a){return a<16?"0"+a.toString(16):a.toString(16)}
+d3.interpolateObject=function(a,b){var e={},f={},c;for(c in a)if(c in b)e[c]=(c in sa||/\bcolor\b/.test(c)?d3.interpolateRgb:d3.interpolate)(a[c],b[c]);else f[c]=a[c];for(c in b)c in a||(f[c]=b[c]);return function(d){for(c in e)f[c]=e[c](d);return f}};var H=/[-+]?(?:\d+\.\d+|\d+\.|\.\d+|\d+)(?:[eE][-]?\d+)?/g,sa={background:1,fill:1,stroke:1};d3.rgb=function(a,b,e){return arguments.length==1?I(""+a,J,ta):J(~~a,~~b,~~e)};function J(a,b,e){return{r:a,g:b,b:e,toString:ua}}
+function ua(){return"#"+K(this.r)+K(this.g)+K(this.b)}function K(a){return a<16?"0"+a.toString(16):a.toString(16)}
 function I(a,b,e){var f,c,d,h,g;if(h=/([a-z]+)\((.*)\)/i.exec(a)){g=h[2].split(",");switch(h[1]){case "hsl":return e(parseFloat(g[0]),parseFloat(g[1])/100,parseFloat(g[2])/100);case "rgb":return b(L(g[0]),L(g[1]),L(g[2]))}}if(e=G[a])return b(e.r,e.g,e.b);if(a==o)return b(0,0,0);if(a.charAt(0)=="#"){if(a.length==4){f=a.charAt(1);f+=f;c=a.charAt(2);c+=c;d=a.charAt(3);d+=d}else if(a.length==7){f=a.substring(1,3);c=a.substring(3,5);d=a.substring(5,7)}f=parseInt(f,16);c=parseInt(c,16);d=parseInt(d,16)}return b(f,
-c,d)}function ta(a,b,e){var f=Math.min(a/=255,b/=255,e/=255),c=Math.max(a,b,e),d=c-f,h=(c+f)/2;if(d){f=h<0.5?d/(c+f):d/(2-c-f);a=a==c?(b-e)/d+(b<e?6:0):b==c?(e-a)/d+2:(a-b)/d+4;a*=60}else f=a=0;return M(a,f,h)}function L(a){var b=parseFloat(a);return a.charAt(a.length-1)=="%"?Math.round(b*2.55):b}
+c,d)}function va(a,b,e){var f=Math.min(a/=255,b/=255,e/=255),c=Math.max(a,b,e),d=c-f,h=(c+f)/2;if(d){f=h<0.5?d/(c+f):d/(2-c-f);a=a==c?(b-e)/d+(b<e?6:0):b==c?(e-a)/d+2:(a-b)/d+4;a*=60}else f=a=0;return M(a,f,h)}function L(a){var b=parseFloat(a);return a.charAt(a.length-1)=="%"?Math.round(b*2.55):b}
 var G={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"},N;for(N in G)G[N]=I(G[N],J,ra);d3.hsl=function(a,b,e){return arguments.length==1?I(""+a,ta,M):M(+a,+b,+e)};
-function M(a,b,e){return{h:a,s:b,l:e,toString:ua}}function ua(){return"hsl("+this.h+","+this.s*100+"%,"+this.l*100+"%)"}function ra(a,b,e){function f(h){if(h>360)h-=360;else if(h<0)h+=360;if(h<60)return c+(d-c)*h/60;if(h<180)return d;if(h<240)return c+(d-c)*(240-h)/60;return c}var c,d;a%=360;if(a<0)a+=360;b=b<0?0:b>1?1:b;e=e<0?0:e>1?1:e;d=e<=0.5?e*(1+b):e+b-e*b;c=2*e-d;return J(Math.round(f(a+120)*255),Math.round(f(a)*255),Math.round(f(a-120)*255))}var P=O([[document]]);P[0].parentNode=document.documentElement;
+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"},N;for(N in G)G[N]=I(G[N],J,ta);d3.hsl=function(a,b,e){return arguments.length==1?I(""+a,va,M):M(+a,+b,+e)};
+function M(a,b,e){return{h:a,s:b,l:e,toString:wa}}function wa(){return"hsl("+this.h+","+this.s*100+"%,"+this.l*100+"%)"}function ta(a,b,e){function f(h){if(h>360)h-=360;else if(h<0)h+=360;if(h<60)return c+(d-c)*h/60;if(h<180)return d;if(h<240)return c+(d-c)*(240-h)/60;return c}var c,d;a%=360;if(a<0)a+=360;b=b<0?0:b>1?1:b;e=e<0?0:e>1?1:e;d=e<=0.5?e*(1+b):e+b-e*b;c=2*e-d;return J(Math.round(f(a+120)*255),Math.round(f(a)*255),Math.round(f(a-120)*255))}var P=O([[document]]);P[0].parentNode=document.documentElement;
 d3.select=function(a){return typeof a=="string"?P.select(a):O([[a]])};d3.selectAll=function(a){return typeof a=="string"?P.selectAll(a):O([x(a)])};
-function O(a){function b(c){for(var d=[],h,g,i,j,m=0,p=a.length;m<p;m++){i=a[m];d.push(h=[]);h.parentNode=i.parentNode;h.parentData=i.parentData;for(var r=0,k=i.length;r<k;r++)if(j=i[r]){h.push(g=c(j));if(g&&"__data__"in j)g.__data__=j.__data__}else h.push(o)}return O(d)}function e(c){for(var d=[],h,g,i,j=0,m=a.length;j<m;j++){g=a[j];for(var p=0,r=g.length;p<r;p++)if(i=g[p]){d.push(h=c(i));h.parentNode=i;h.parentData=i.__data__}}return O(d)}function f(c){for(var d=0,h=a.length;d<h;d++)for(var g=a[d],
-i=0,j=g.length;i<j;i++){var m=g[i];if(m)return c.call(m,m.__data__,i)}return o}a.select=function(c){return b(function(d){return d.querySelector(c)})};a.selectAll=function(c){return e(function(d){return x(d.querySelectorAll(c))})};a.filter=function(c){for(var d=[],h,g,i,j=0,m=a.length;j<m;j++){g=a[j];d.push(h=[]);h.parentNode=g.parentNode;h.parentData=g.parentData;for(var p=0,r=g.length;p<r;p++)if((i=g[p])&&c.call(i,i.__data__,p))h.push(i)}return O(d)};a.data=function(c,d){function h(k,n){function q(Ea){return k.parentNode.appendChild(Ea)}
-var l=0,t=k.length,u=n.length,s=Math.min(t,u),v=Math.max(t,u),z=[],A=[],w=[],B,C;if(d){s={};v=[];var D;C=n.length;for(l=0;l<t;l++){D=d.nodeKey(B=k[l]);if(D in s)w[C++]=k[l];else{s[D]=B;v.push(D)}}for(l=0;l<u;l++){if(B=s[D=d.dataKey(C=n[l])]){B.__data__=C;z[l]=B;A[l]=w[l]=o}else{A[l]={appendChild:q,__data__:C};z[l]=w[l]=o}delete s[D]}for(l=0;l<t;l++)if(v[l]in s)w[l]=k[l]}else{for(;l<s;l++){B=k[l];C=n[l];if(B){B.__data__=C;z[l]=B;A[l]=w[l]=o}else{A[l]={appendChild:q,__data__:C};z[l]=w[l]=o}}for(;l<
-u;l++){A[l]={appendChild:q,__data__:n[l]};z[l]=w[l]=o}for(;l<v;l++){w[l]=k[l];A[l]=z[l]=o}}A.parentNode=z.parentNode=w.parentNode=k.parentNode;A.parentData=z.parentData=w.parentData=k.parentData;m.push(A);p.push(z);r.push(w)}var g=-1,i=a.length,j,m=[],p=[],r=[];if(typeof d=="string")d=va(d);if(typeof c=="function")for(;++g<i;)h(j=a[g],c.call(j,j.parentData,g));else for(;++g<i;)h(j=a[g],c);g=O(p);g.enter=function(k){return O(m).append(k)};g.exit=function(){return O(r)};return g};a.each=function(c){for(var d=
-0,h=a.length;d<h;d++)for(var g=a[d],i=0,j=g.length;i<j;i++){var m=g[i];m&&c.call(m,m.__data__,i)}return a};a.node=function(){return f(function(){return this})};a.attr=function(c,d){function h(){this.removeAttribute(c)}function g(){this.removeAttributeNS(c.space,c.local)}function i(){this.setAttribute(c,d)}function j(){this.setAttributeNS(c.space,c.local,d)}function m(){var r=d.apply(this,arguments);r==o?this.removeAttribute(c):this.setAttribute(c,r)}function p(){var r=d.apply(this,arguments);r==o?
-this.removeAttributeNS(c.space,c.local):this.setAttributeNS(c.space,c.local,r)}c=d3.ns.qualify(c);if(arguments.length<2)return f(c.local?function(){return this.getAttributeNS(c.space,c.local)}:function(){return this.getAttribute(c)});return a.each(d==o?c.local?g:h:typeof d=="function"?c.local?p:m:c.local?j:i)};a.style=function(c,d,h){function g(){this.style.removeProperty(c)}function i(){this.style.setProperty(c,d,h)}function j(){var m=d.apply(this,arguments);m==o?this.style.removeProperty(c):this.style.setProperty(c,
-m,h)}if(arguments.length<3)h=o;if(arguments.length<2)return f(function(){return window.getComputedStyle(this,o).getPropertyValue(c)});return a.each(d==o?g:typeof d=="function"?j:i)};a.property=function(c,d){function h(){delete this[c]}function g(){this[c]=d}function i(){var j=d.apply(this,arguments);if(j==o)delete this[c];else this[c]=j}c=d3.ns.qualify(c);if(arguments.length<2)return f(function(){return this[c]});return a.each(d==o?h:typeof d=="function"?i:g)};a.text=function(c){function d(){this.appendChild(document.createTextNode(c))}
-function h(){var g=c.apply(this,arguments);g!=o&&this.appendChild(document.createTextNode(g))}if(arguments.length<1)return f(function(){return this.textContent});a.each(function(){for(;this.lastChild;)this.removeChild(this.lastChild)});return c==o?a:a.each(typeof c=="function"?h:d)};a.html=function(c){function d(){this.innerHTML=c}function h(){this.innerHTML=c.apply(this,arguments)}if(arguments.length<1)return f(function(){return this.innerHTML});return a.each(typeof c=="function"?h:d)};a.append=
-function(c){function d(g){return g.appendChild(document.createElement(c))}function h(g){return g.appendChild(document.createElementNS(c.space,c.local))}c=d3.ns.qualify(c);return b(c.local?h:d)};a.remove=function(){return b(function(c){var d=c.parentNode;d.removeChild(c);return d})};a.sort=function(c){c=wa.apply(this,arguments);for(var d=0,h=a.length;d<h;d++){var g=a[d];g.sort(c);for(var i=1,j=g.length,m=g[0];i<j;i++){var p=g[i];if(p){m&&m.parentNode.insertBefore(p,m.nextSibling);m=p}}}return a};a.on=
-function(c,d){c="on"+c;return a.each(function(h,g){this[c]=function(i){var j=d3.event;d3.event=i;try{d.call(this,h,g)}finally{d3.event=j}}})};a.transition=function(){return Q(a)};a.call=E;return a}function va(a){return{nodeKey:function(b){return b.getAttribute(a)},dataKey:function(b){return b[a]}}}function wa(a){arguments.length||(a=xa);return function(b,e){return a(b&&b.__data__,e&&e.__data__)}}function xa(a,b){return a<b?-1:a>b?1:0}d3.transition=P.transition;var ya=0,R=0;
-function Q(a){function b(k){var n=true,q=-1;a.each(function(){if(i[++q]!=2){var l=(k-j[q])/m[q],t=this.__transition__,u,s,v=d[q];if(l<1){n=false;if(l<0)return}else l=1;if(i[q]){if(t.d!=f){i[q]=2;return}}else if(!t||t.d>f){i[q]=2;return}else{i[q]=1;g.start.dispatch.apply(this,arguments);v=d[q]={};t.d=f;for(s in c)v[s]=c[s].apply(this,arguments)}u=r(l);for(s in c)v[s].call(this,u);if(l==1){i[q]=2;if(t.d==f){l=t.o;if(l==f){delete this.__transition__;h&&this.parentNode.removeChild(this)}R=f;g.end.dispatch.apply(this,
-arguments);R=0;t.o=l}}}});return n}var e={},f=R||++ya,c={},d=[],h=false,g=d3.dispatch("start","end"),i=[],j=[],m=[],p,r=d3.ease("cubic-in-out");a.each(function(){(this.__transition__||(this.__transition__={})).o=f});e.delay=function(k){var n=Infinity,q=-1;if(typeof k=="function")a.each(function(){var l=j[++q]=+k.apply(this,arguments);if(l<n)n=l});else{n=+k;a.each(function(){j[++q]=n})}za(b,n);return e};e.duration=function(k){var n=-1;if(typeof k=="function"){p=0;a.each(function(){var q=m[++n]=+k.apply(this,
-arguments);if(q>p)p=q})}else{p=+k;a.each(function(){m[++n]=p})}return e};e.ease=function(k){r=typeof k=="string"?d3.ease(k):k;return e};e.attrTween=function(k,n){function q(t,u){var s=n.call(this,t,u,this.getAttribute(k));return function(v){this.setAttribute(k,s(v))}}function l(t,u){var s=n.call(this,t,u,this.getAttributeNS(k.space,k.local));return function(v){this.setAttributeNS(k.space,k.local,s(v))}}c["attr."+k]=k.local?l:q;return e};e.attr=function(k,n){return e.attrTween(k,Aa(n))};e.styleTween=
-function(k,n,q){c["style."+k]=function(l,t){var u=n.call(this,l,t,window.getComputedStyle(this,o).getPropertyValue(k));return function(s){this.style.setProperty(k,u(s),q)}};return e};e.style=function(k,n,q){return e.styleTween(k,Aa(n),q)};e.select=function(k){var n;k=Q(a.select(k)).ease(r);n=-1;k.delay(function(){return j[++n]});n=-1;k.duration(function(){return m[++n]});return k};e.selectAll=function(k){var n;k=Q(a.selectAll(k)).ease(r);n=-1;k.delay(function(q,l){return j[l?n:++n]});n=-1;k.duration(function(q,
-l){return m[l?n:++n]});return k};e.remove=function(){h=true;return e};e.each=function(k,n){g[k].add(n);return e};e.call=E;return e.delay(0).duration(250)}var S=o,T=0,U;function za(a,b){var e=Date.now(),f=false,c=e+b,d=S;if(isFinite(b)){for(;d;){if(d.n==a){d.j=e;d.delay=b;f=true}else{var h=d.j+d.delay;if(h<c)c=h}d=d.next}f||(S={n:a,j:e,delay:b,next:S});if(!U){clearTimeout(T);T=setTimeout(Ba,Math.max(24,c-e))}}}function Ba(){U=setInterval(Ca,24);T=0}
-function Ca(){for(var a,b=Date.now(),e=S;e;){a=b-e.j;if(a>e.delay)e.t=e.n(a);e=e.next}a=o;for(b=S;b;)b=b.t?a?a.next=b.next:S=b.next:(a=b).next;a||(U=clearInterval(U))}function Aa(a){return typeof a=="function"?function(b,e,f){return d3.interpolate(f,a.call(this,b,e))}:function(b,e,f){return d3.interpolate(f,a)}}d3.scale={};
-d3.scale.linear=function(){function a(j){return i((j-e)*h)}function b(j){var m=Math.min(e,f),p=Math.max(e,f),r=p-m,k=Math.pow(10,Math.floor(Math.log(r/j)/Math.LN10));j=j/(r/k);if(j<=0.15)k*=10;else if(j<=0.35)k*=5;else if(j<=0.75)k*=2;return{start:Math.ceil(m/k)*k,stop:Math.floor(p/k)*k+k*0.5,q:k}}var e=0,f=1,c=0,d=1,h=1/(f-e),g=(f-e)/(d-c),i=d3.interpolate(c,d);a.invert=function(j){return(j-c)*g+e};a.domain=function(j){if(!arguments.length)return[e,f];e=j[0];f=j[1];h=1/(f-e);g=(f-e)/(d-c);return a};
+function O(a){function b(c){for(var d=[],h,g,i,j,l=0,p=a.length;l<p;l++){i=a[l];d.push(h=[]);h.parentNode=i.parentNode;h.parentData=i.parentData;for(var r=0,k=i.length;r<k;r++)if(j=i[r]){h.push(g=c(j));if(g&&"__data__"in j)g.__data__=j.__data__}else h.push(o)}return O(d)}function e(c){for(var d=[],h,g,i,j=0,l=a.length;j<l;j++){g=a[j];for(var p=0,r=g.length;p<r;p++)if(i=g[p]){d.push(h=c(i));h.parentNode=i;h.parentData=i.__data__}}return O(d)}function f(c){for(var d=0,h=a.length;d<h;d++)for(var g=a[d],
+i=0,j=g.length;i<j;i++){var l=g[i];if(l)return c.call(l,l.__data__,i)}return o}a.select=function(c){return b(function(d){return d.querySelector(c)})};a.selectAll=function(c){return e(function(d){return x(d.querySelectorAll(c))})};a.filter=function(c){for(var d=[],h,g,i,j=0,l=a.length;j<l;j++){g=a[j];d.push(h=[]);h.parentNode=g.parentNode;h.parentData=g.parentData;for(var p=0,r=g.length;p<r;p++)if((i=g[p])&&c.call(i,i.__data__,p))h.push(i)}return O(d)};a.data=function(c,d){function h(k,n){function q(Ga){return k.parentNode.appendChild(Ga)}
+var m=0,t=k.length,u=n.length,s=Math.min(t,u),v=Math.max(t,u),z=[],A=[],w=[],B,C;if(d){s={};v=[];var D;C=n.length;for(m=0;m<t;m++){D=d.nodeKey(B=k[m]);if(D in s)w[C++]=k[m];else{s[D]=B;v.push(D)}}for(m=0;m<u;m++){if(B=s[D=d.dataKey(C=n[m])]){B.__data__=C;z[m]=B;A[m]=w[m]=o}else{A[m]={appendChild:q,__data__:C};z[m]=w[m]=o}delete s[D]}for(m=0;m<t;m++)if(v[m]in s)w[m]=k[m]}else{for(;m<s;m++){B=k[m];C=n[m];if(B){B.__data__=C;z[m]=B;A[m]=w[m]=o}else{A[m]={appendChild:q,__data__:C};z[m]=w[m]=o}}for(;m<
+u;m++){A[m]={appendChild:q,__data__:n[m]};z[m]=w[m]=o}for(;m<v;m++){w[m]=k[m];A[m]=z[m]=o}}A.parentNode=z.parentNode=w.parentNode=k.parentNode;A.parentData=z.parentData=w.parentData=k.parentData;l.push(A);p.push(z);r.push(w)}var g=-1,i=a.length,j,l=[],p=[],r=[];if(typeof d=="string")d=xa(d);if(typeof c=="function")for(;++g<i;)h(j=a[g],c.call(j,j.parentData,g));else for(;++g<i;)h(j=a[g],c);g=O(p);g.enter=function(k){return O(l).append(k)};g.exit=function(){return O(r)};return g};a.each=function(c){for(var d=
+0,h=a.length;d<h;d++)for(var g=a[d],i=0,j=g.length;i<j;i++){var l=g[i];l&&c.call(l,l.__data__,i)}return a};a.node=function(){return f(function(){return this})};a.attr=function(c,d){function h(){this.removeAttribute(c)}function g(){this.removeAttributeNS(c.space,c.local)}function i(){this.setAttribute(c,d)}function j(){this.setAttributeNS(c.space,c.local,d)}function l(){var r=d.apply(this,arguments);r==o?this.removeAttribute(c):this.setAttribute(c,r)}function p(){var r=d.apply(this,arguments);r==o?
+this.removeAttributeNS(c.space,c.local):this.setAttributeNS(c.space,c.local,r)}c=d3.ns.qualify(c);if(arguments.length<2)return f(c.local?function(){return this.getAttributeNS(c.space,c.local)}:function(){return this.getAttribute(c)});return a.each(d==o?c.local?g:h:typeof d=="function"?c.local?p:l:c.local?j:i)};a.classed=function(c,d){function h(){var l=this.className;if(!j.test(l))this.className=E(l+" "+c)}function g(){var l=E(this.className.replace(j," "));this.className=l.length?l:o}function i(){(d.apply(this,
+arguments)?h:g).call(this)}var j=RegExp("(^|\\s+)"+d3.requote(c)+"(\\s+|$)","g");if(arguments.length<2)return f(function(){return j.test(this.className)});return a.each(typeof d=="function"?i:d?h:g)};a.style=function(c,d,h){function g(){this.style.removeProperty(c)}function i(){this.style.setProperty(c,d,h)}function j(){var l=d.apply(this,arguments);l==o?this.style.removeProperty(c):this.style.setProperty(c,l,h)}if(arguments.length<3)h=o;if(arguments.length<2)return f(function(){return window.getComputedStyle(this,
+o).getPropertyValue(c)});return a.each(d==o?g:typeof d=="function"?j:i)};a.property=function(c,d){function h(){delete this[c]}function g(){this[c]=d}function i(){var j=d.apply(this,arguments);if(j==o)delete this[c];else this[c]=j}c=d3.ns.qualify(c);if(arguments.length<2)return f(function(){return this[c]});return a.each(d==o?h:typeof d=="function"?i:g)};a.text=function(c){function d(){this.appendChild(document.createTextNode(c))}function h(){var g=c.apply(this,arguments);g!=o&&this.appendChild(document.createTextNode(g))}
+if(arguments.length<1)return f(function(){return this.textContent});a.each(function(){for(;this.lastChild;)this.removeChild(this.lastChild)});return c==o?a:a.each(typeof c=="function"?h:d)};a.html=function(c){function d(){this.innerHTML=c}function h(){this.innerHTML=c.apply(this,arguments)}if(arguments.length<1)return f(function(){return this.innerHTML});return a.each(typeof c=="function"?h:d)};a.append=function(c){function d(g){return g.appendChild(document.createElement(c))}function h(g){return g.appendChild(document.createElementNS(c.space,
+c.local))}c=d3.ns.qualify(c);return b(c.local?h:d)};a.remove=function(){return b(function(c){var d=c.parentNode;d.removeChild(c);return d})};a.sort=function(c){c=ya.apply(this,arguments);for(var d=0,h=a.length;d<h;d++){var g=a[d];g.sort(c);for(var i=1,j=g.length,l=g[0];i<j;i++){var p=g[i];if(p){l&&l.parentNode.insertBefore(p,l.nextSibling);l=p}}}return a};a.on=function(c,d){c="on"+c;return a.each(function(h,g){this[c]=function(i){var j=d3.event;d3.event=i;try{d.call(this,h,g)}finally{d3.event=j}}})};
+a.transition=function(){return Q(a)};a.call=ba;return a}function xa(a){return{nodeKey:function(b){return b.getAttribute(a)},dataKey:function(b){return b[a]}}}function ya(a){if(!arguments.length)a=d3.u;return function(b,e){return a(b&&b.__data__,e&&e.__data__)}}d3.transition=P.transition;var za=0,R=0;
+function Q(a){function b(k){var n=true,q=-1;a.each(function(){if(i[++q]!=2){var m=(k-j[q])/l[q],t=this.__transition__,u,s,v=d[q];if(m<1){n=false;if(m<0)return}else m=1;if(i[q]){if(t.d!=f){i[q]=2;return}}else if(!t||t.d>f){i[q]=2;return}else{i[q]=1;g.start.dispatch.apply(this,arguments);v=d[q]={};t.d=f;for(s in c)v[s]=c[s].apply(this,arguments)}u=r(m);for(s in c)v[s].call(this,u);if(m==1){i[q]=2;if(t.d==f){m=t.o;if(m==f){delete this.__transition__;h&&this.parentNode.removeChild(this)}R=f;g.end.dispatch.apply(this,
+arguments);R=0;t.o=m}}}});return n}var e={},f=R||++za,c={},d=[],h=false,g=d3.dispatch("start","end"),i=[],j=[],l=[],p,r=d3.ease("cubic-in-out");a.each(function(){(this.__transition__||(this.__transition__={})).o=f});e.delay=function(k){var n=Infinity,q=-1;if(typeof k=="function")a.each(function(){var m=j[++q]=+k.apply(this,arguments);if(m<n)n=m});else{n=+k;a.each(function(){j[++q]=n})}Aa(b,n);return e};e.duration=function(k){var n=-1;if(typeof k=="function"){p=0;a.each(function(){var q=l[++n]=+k.apply(this,
+arguments);if(q>p)p=q})}else{p=+k;a.each(function(){l[++n]=p})}return e};e.ease=function(k){r=typeof k=="string"?d3.ease(k):k;return e};e.attrTween=function(k,n){function q(t,u){var s=n.call(this,t,u,this.getAttribute(k));return function(v){this.setAttribute(k,s(v))}}function m(t,u){var s=n.call(this,t,u,this.getAttributeNS(k.space,k.local));return function(v){this.setAttributeNS(k.space,k.local,s(v))}}c["attr."+k]=k.local?m:q;return e};e.attr=function(k,n){return e.attrTween(k,Ba(n))};e.styleTween=
+function(k,n,q){c["style."+k]=function(m,t){var u=n.call(this,m,t,window.getComputedStyle(this,o).getPropertyValue(k));return function(s){this.style.setProperty(k,u(s),q)}};return e};e.style=function(k,n,q){return e.styleTween(k,Ba(n),q)};e.select=function(k){var n;k=Q(a.select(k)).ease(r);n=-1;k.delay(function(){return j[++n]});n=-1;k.duration(function(){return l[++n]});return k};e.selectAll=function(k){var n;k=Q(a.selectAll(k)).ease(r);n=-1;k.delay(function(q,m){return j[m?n:++n]});n=-1;k.duration(function(q,
+m){return l[m?n:++n]});return k};e.remove=function(){h=true;return e};e.each=function(k,n){g[k].add(n);return e};e.call=ba;return e.delay(0).duration(250)}var S=o,T=0,U;function Aa(a,b){var e=Date.now(),f=false,c=e+b,d=S;if(isFinite(b)){for(;d;){if(d.n==a){d.j=e;d.delay=b;f=true}else{var h=d.j+d.delay;if(h<c)c=h}d=d.next}f||(S={n:a,j:e,delay:b,next:S});if(!U){clearTimeout(T);T=setTimeout(Ca,Math.max(24,c-e))}}}function Ca(){U=setInterval(Da,24);T=0}
+function Da(){for(var a,b=Date.now(),e=S;e;){a=b-e.j;if(a>e.delay)e.t=e.n(a);e=e.next}a=o;for(b=S;b;)b=b.t?a?a.next=b.next:S=b.next:(a=b).next;a||(U=clearInterval(U))}function Ba(a){return typeof a=="function"?function(b,e,f){return d3.interpolate(f,a.call(this,b,e))}:function(b,e,f){return d3.interpolate(f,a)}}d3.scale={};
+d3.scale.linear=function(){function a(j){return i((j-e)*h)}function b(j){var l=Math.min(e,f),p=Math.max(e,f),r=p-l,k=Math.pow(10,Math.floor(Math.log(r/j)/Math.LN10));j=j/(r/k);if(j<=0.15)k*=10;else if(j<=0.35)k*=5;else if(j<=0.75)k*=2;return{start:Math.ceil(l/k)*k,stop:Math.floor(p/k)*k+k*0.5,q:k}}var e=0,f=1,c=0,d=1,h=1/(f-e),g=(f-e)/(d-c),i=d3.interpolate(c,d);a.invert=function(j){return(j-c)*g+e};a.domain=function(j){if(!arguments.length)return[e,f];e=j[0];f=j[1];h=1/(f-e);g=(f-e)/(d-c);return a};
 a.range=function(j){if(!arguments.length)return[c,d];c=j[0];d=j[1];g=(f-e)/(d-c);i=d3.interpolate(c,d);return a};a.ticks=function(j){j=b(j);return d3.range(j.start,j.stop,j.q)};a.tickFormat=function(j){return d3.format(",."+Math.max(0,-Math.floor(Math.log(b(j).q)/Math.LN10+0.01))+"f")};return a};
 d3.scale.log=function(){function a(c){return Math.log(c)/Math.LN10}function b(c){return Math.pow(10,c)}function e(c){return f(a(c))}var f=d3.scale.linear();e.invert=function(c){return b(f.invert(c))};e.domain=function(c){if(!arguments.length)return f.domain().map(b);f.domain(c.map(a));return e};e.range=function(){var c=f.range.apply(f,arguments);return arguments.length?e:c};e.ticks=function(){var c=f.domain(),d=Math.floor(c[0]),h=Math.ceil(c[1]),g=[];if(c.every(isFinite)){for(;++d<=h;)for(c=1;c<10;c++)g.push(b(d)*
 c);g.push(b(d))}return g};e.tickFormat=function(){return function(c){return c.toPrecision(1)}};return e};
 d3.scale.pow=function(){function a(h){return Math.pow(h,c)}function b(h){return Math.pow(h,d)}function e(h){return f(a(h))}var f=d3.scale.linear(),c=1,d=1/c;e.invert=function(h){return b(f.invert(h))};e.domain=function(h){if(!arguments.length)return f.domain().map(b);f.domain(h.map(a));return e};e.range=function(){var h=f.range.apply(f,arguments);return arguments.length?e:h};e.exponent=function(h){if(!arguments.length)return c;var g=e.domain();c=h;d=1/h;return e.domain(g)};return e};
 d3.scale.sqrt=function(){return d3.scale.pow().exponent(0.5)};
 d3.scale.ordinal=function(){function a(d){d=d in e?e[d]:e[d]=b.push(d)-1;return f[d%f.length]}var b=[],e={},f=[],c=0;a.domain=function(d){if(!arguments.length)return b;b=d;e={};for(var h=-1,g=-1,i=b.length;++h<i;){d=b[h];d in e||(e[d]=++g)}return a};a.range=function(d){if(!arguments.length)return f;f=d;return a};a.rangePoints=function(d,h){if(arguments.length<2)h=0;var g=d[0],i=d[1],j=(i-g)/(b.length-1+h);f=b.length==1?[(g+i)/2]:d3.range(g+j*h/2,i+j/2,j);c=0;return a};a.rangeBands=function(d,h){if(arguments.length<
-2)h=0;var g=d[0],i=d[1],j=(i-g)/(b.length+h);f=d3.range(g+j*h,i,j);c=j*(1-h);return a};a.rangeBand=function(){return c};return a};d3.scale.category10=function(){return d3.scale.ordinal().range(Da)};d3.scale.category20=function(){return d3.scale.ordinal().range(Fa)};d3.scale.category20b=function(){return d3.scale.ordinal().range(Ga)};d3.scale.category20c=function(){return d3.scale.ordinal().range(Ha)};
-var Da=["#1f77b4","#ff7f0e","#2ca02c","#d62728","#9467bd","#8c564b","#e377c2","#7f7f7f","#bcbd22","#17becf"],Fa=["#1f77b4","#aec7e8","#ff7f0e","#ffbb78","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5","#8c564b","#c49c94","#e377c2","#f7b6d2","#7f7f7f","#c7c7c7","#bcbd22","#dbdb8d","#17becf","#9edae5"],Ga=["#393b79","#5254a3","#6b6ecf","#9c9ede","#637939","#8ca252","#b5cf6b","#cedb9c","#8c6d31","#bd9e39","#e7ba52","#e7cb94","#843c39","#ad494a","#d6616b","#e7969c","#7b4173","#a55194","#ce6dbd",
-"#de9ed6"],Ha=["#3182bd","#6baed6","#9ecae1","#c6dbef","#e6550d","#fd8d3c","#fdae6b","#fdd0a2","#31a354","#74c476","#a1d99b","#c7e9c0","#756bb1","#9e9ac8","#bcbddc","#dadaeb","#636363","#969696","#bdbdbd","#d9d9d9"];d3.svg={};
-d3.svg.arc=function(){function a(d,h){var g=b.call(this,d,h),i=e.call(this,d,h),j=f.call(this,d,h)+V,m=c.call(this,d,h)+V,p=m-j,r=Math.cos(j);j=Math.sin(j);var k=Math.cos(m);m=Math.sin(m);return"M"+i*r+","+i*j+"A"+i+","+i+" 0 "+(p<Math.PI?"0":"1")+",1 "+i*k+","+i*m+"L"+g*k+","+g*m+"A"+g+","+g+" 0 "+(p<Math.PI?"0":"1")+",0 "+g*r+","+g*j+"Z"}var b=Ia,e=Ja,f=Ka,c=La;a.innerRadius=function(d){if(!arguments.length)return b;b=y(d);return a};a.outerRadius=function(d){if(!arguments.length)return e;e=y(d);
-return a};a.startAngle=function(d){if(!arguments.length)return f;f=y(d);return a};a.endAngle=function(d){if(!arguments.length)return c;c=y(d);return a};return a};var V=-Math.PI/2;function Ia(a){return a.innerRadius}function Ja(a){return a.outerRadius}function Ka(a){return a.startAngle}function La(a){return a.endAngle}
-d3.svg.line=function(){function a(d){return d.length<1?o:"M"+c(W(this,d,b,e))}var b=Ma,e=Na,f="linear",c=X[f];a.x=function(d){if(!arguments.length)return b;b=d;return a};a.y=function(d){if(!arguments.length)return e;e=d;return a};a.interpolate=function(d){if(!arguments.length)return f;c=X[f=d];return a};return a};
-function W(a,b,e,f){var c=[],d=-1,h=b.length,g=typeof e=="function",i=typeof f=="function",j;if(g&&i)for(;++d<h;)c.push([e.call(a,j=b[d],d),f.call(a,j,d)]);else if(g)for(;++d<h;)c.push([e.call(a,b[d],d),f]);else if(i)for(;++d<h;)c.push([e,f.call(a,b[d],d)]);else for(;++d<h;)c.push([e,f]);return c}function Ma(a){return a.x}function Na(a){return a.y}var X={linear:Oa,basis:Pa};
-function Oa(a){if(a.length<1)return o;var b=[],e=0,f=a.length,c=a[0];for(b.push(c[0],",",c[1]);++e<f;)b.push("L",(c=a[e])[0],",",c[1]);return b.join("")}function Pa(a){if(a.length<3)return Oa(a);var b=[],e=1,f=a.length,c=a[0],d=c[0],h=c[1],g=[d,d,d,(c=a[1])[0]],i=[h,h,h,c[1]];b.push(d,",",h);for(Y(b,g,i);++e<f;){c=a[e];g.shift();g.push(c[0]);i.shift();i.push(c[1]);Y(b,g,i)}for(e=-1;++e<2;){g.shift();g.push(c[0]);i.shift();i.push(c[1]);Y(b,g,i)}return b.join("")}
-function Z(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]}var Qa=[0,2/3,1/3,0],Ra=[0,1/3,2/3,0],Sa=[0,1/6,2/3,1/6];function Y(a,b,e){a.push("C",Z(Qa,b),",",Z(Qa,e),",",Z(Ra,b),",",Z(Ra,e),",",Z(Sa,b),",",Z(Sa,e))}
-d3.svg.area=function(){function a(h){return h.length<1?o:"M"+d(W(this,h,b,f))+"L"+d(W(this,h,b,e).reverse())+"Z"}var b=Ma,e=Ta,f=Na,c="linear",d=X[c];a.x=function(h){if(!arguments.length)return b;b=h;return a};a.y0=function(h){if(!arguments.length)return e;e=h;return a};a.y1=function(h){if(!arguments.length)return f;f=h;return a};a.interpolate=function(h){if(!arguments.length)return c;d=X[c=h];return a};return a};function Ta(){return 0}
-d3.svg.chord=function(){function a(g,i){var j=b(this,e,g,i),m=b(this,f,g,i);return"M"+j.c+("A"+j.r+","+j.r+" 0 0,1 "+j.p)+(j.k==m.k&&j.m==m.m?"Q 0,0 "+j.c:"Q 0,0 "+m.c+("A"+m.r+","+m.r+" 0 0,1 "+m.p)+("Q 0,0 "+j.c))+"Z"}function b(g,i,j,m){var p=i.call(g,j,m);i=c.call(g,p,m);j=d.call(g,p,m)+V;g=h.call(g,p,m)+V;return{r:i,k:j,m:g,c:[i*Math.cos(j),i*Math.sin(j)],p:[i*Math.cos(g),i*Math.sin(g)]}}var e=Ua,f=Va,c=Wa,d=Ka,h=La;a.radius=function(g){if(!arguments.length)return c;c=y(g);return a};a.source=
-function(g){if(!arguments.length)return e;e=y(g);return a};a.target=function(g){if(!arguments.length)return f;f=y(g);return a};a.startAngle=function(g){if(!arguments.length)return d;d=y(g);return a};a.endAngle=function(g){if(!arguments.length)return h;h=y(g);return a};return a};function Ua(a){return a.source}function Va(a){return a.target}function Wa(a){return a.radius}
+2)h=0;var g=d[0],i=d[1],j=(i-g)/(b.length+h);f=d3.range(g+j*h,i,j);c=j*(1-h);return a};a.rangeBand=function(){return c};return a};d3.scale.category10=function(){return d3.scale.ordinal().range(Ea)};d3.scale.category20=function(){return d3.scale.ordinal().range(Fa)};d3.scale.category20b=function(){return d3.scale.ordinal().range(Ha)};d3.scale.category20c=function(){return d3.scale.ordinal().range(Ia)};
+var Ea=["#1f77b4","#ff7f0e","#2ca02c","#d62728","#9467bd","#8c564b","#e377c2","#7f7f7f","#bcbd22","#17becf"],Fa=["#1f77b4","#aec7e8","#ff7f0e","#ffbb78","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5","#8c564b","#c49c94","#e377c2","#f7b6d2","#7f7f7f","#c7c7c7","#bcbd22","#dbdb8d","#17becf","#9edae5"],Ha=["#393b79","#5254a3","#6b6ecf","#9c9ede","#637939","#8ca252","#b5cf6b","#cedb9c","#8c6d31","#bd9e39","#e7ba52","#e7cb94","#843c39","#ad494a","#d6616b","#e7969c","#7b4173","#a55194","#ce6dbd",
+"#de9ed6"],Ia=["#3182bd","#6baed6","#9ecae1","#c6dbef","#e6550d","#fd8d3c","#fdae6b","#fdd0a2","#31a354","#74c476","#a1d99b","#c7e9c0","#756bb1","#9e9ac8","#bcbddc","#dadaeb","#636363","#969696","#bdbdbd","#d9d9d9"];d3.svg={};
+d3.svg.arc=function(){function a(d,h){var g=b.call(this,d,h),i=e.call(this,d,h),j=f.call(this,d,h)+V,l=c.call(this,d,h)+V,p=l-j,r=Math.cos(j);j=Math.sin(j);var k=Math.cos(l);l=Math.sin(l);return"M"+i*r+","+i*j+"A"+i+","+i+" 0 "+(p<Math.PI?"0":"1")+",1 "+i*k+","+i*l+"L"+g*k+","+g*l+"A"+g+","+g+" 0 "+(p<Math.PI?"0":"1")+",0 "+g*r+","+g*j+"Z"}var b=Ja,e=Ka,f=La,c=Ma;a.innerRadius=function(d){if(!arguments.length)return b;b=y(d);return a};a.outerRadius=function(d){if(!arguments.length)return e;e=y(d);
+return a};a.startAngle=function(d){if(!arguments.length)return f;f=y(d);return a};a.endAngle=function(d){if(!arguments.length)return c;c=y(d);return a};return a};var V=-Math.PI/2;function Ja(a){return a.innerRadius}function Ka(a){return a.outerRadius}function La(a){return a.startAngle}function Ma(a){return a.endAngle}
+d3.svg.line=function(){function a(d){return d.length<1?o:"M"+c(W(this,d,b,e))}var b=Na,e=Oa,f="linear",c=X[f];a.x=function(d){if(!arguments.length)return b;b=d;return a};a.y=function(d){if(!arguments.length)return e;e=d;return a};a.interpolate=function(d){if(!arguments.length)return f;c=X[f=d];return a};return a};
+function W(a,b,e,f){var c=[],d=-1,h=b.length,g=typeof e=="function",i=typeof f=="function",j;if(g&&i)for(;++d<h;)c.push([e.call(a,j=b[d],d),f.call(a,j,d)]);else if(g)for(;++d<h;)c.push([e.call(a,b[d],d),f]);else if(i)for(;++d<h;)c.push([e,f.call(a,b[d],d)]);else for(;++d<h;)c.push([e,f]);return c}function Na(a){return a.x}function Oa(a){return a.y}var X={linear:Pa,basis:Qa};
+function Pa(a){if(a.length<1)return o;var b=[],e=0,f=a.length,c=a[0];for(b.push(c[0],",",c[1]);++e<f;)b.push("L",(c=a[e])[0],",",c[1]);return b.join("")}function Qa(a){if(a.length<3)return Pa(a);var b=[],e=1,f=a.length,c=a[0],d=c[0],h=c[1],g=[d,d,d,(c=a[1])[0]],i=[h,h,h,c[1]];b.push(d,",",h);for(Y(b,g,i);++e<f;){c=a[e];g.shift();g.push(c[0]);i.shift();i.push(c[1]);Y(b,g,i)}for(e=-1;++e<2;){g.shift();g.push(c[0]);i.shift();i.push(c[1]);Y(b,g,i)}return b.join("")}
+function Z(a,b){return a[0]*b[0]+a[1]*b[1]+a[2]*b[2]+a[3]*b[3]}var Ra=[0,2/3,1/3,0],Sa=[0,1/3,2/3,0],Ta=[0,1/6,2/3,1/6];function Y(a,b,e){a.push("C",Z(Ra,b),",",Z(Ra,e),",",Z(Sa,b),",",Z(Sa,e),",",Z(Ta,b),",",Z(Ta,e))}
+d3.svg.area=function(){function a(h){return h.length<1?o:"M"+d(W(this,h,b,f))+"L"+d(W(this,h,b,e).reverse())+"Z"}var b=Na,e=Ua,f=Oa,c="linear",d=X[c];a.x=function(h){if(!arguments.length)return b;b=h;return a};a.y0=function(h){if(!arguments.length)return e;e=h;return a};a.y1=function(h){if(!arguments.length)return f;f=h;return a};a.interpolate=function(h){if(!arguments.length)return c;d=X[c=h];return a};return a};function Ua(){return 0}
+d3.svg.chord=function(){function a(g,i){var j=b(this,e,g,i),l=b(this,f,g,i);return"M"+j.c+("A"+j.r+","+j.r+" 0 0,1 "+j.p)+(j.k==l.k&&j.m==l.m?"Q 0,0 "+j.c:"Q 0,0 "+l.c+("A"+l.r+","+l.r+" 0 0,1 "+l.p)+("Q 0,0 "+j.c))+"Z"}function b(g,i,j,l){var p=i.call(g,j,l);i=c.call(g,p,l);j=d.call(g,p,l)+V;g=h.call(g,p,l)+V;return{r:i,k:j,m:g,c:[i*Math.cos(j),i*Math.sin(j)],p:[i*Math.cos(g),i*Math.sin(g)]}}var e=Va,f=Wa,c=Xa,d=La,h=Ma;a.radius=function(g){if(!arguments.length)return c;c=y(g);return a};a.source=
+function(g){if(!arguments.length)return e;e=y(g);return a};a.target=function(g){if(!arguments.length)return f;f=y(g);return a};a.startAngle=function(g){if(!arguments.length)return d;d=y(g);return a};a.endAngle=function(g){if(!arguments.length)return h;h=y(g);return a};return a};function Va(a){return a.source}function Wa(a){return a.target}function Xa(a){return a.radius}
 d3.svg.mouse=function(a){var b=(a.ownerSVGElement||a).createSVGPoint();if($<0&&(window.scrollX||window.scrollY)){var e=d3.select(document.body).append("svg:svg").style("position","absolute").style("top",0).style("left",0),f=e[0][0].getScreenCTM();$=!(f.f||f.e);e.remove()}if($){b.x=d3.event.pageX;b.y=d3.event.pageY}else{b.x=d3.event.clientX;b.y=d3.event.clientY}b=b.matrixTransform(a.getScreenCTM().inverse());return[b.x,b.y]};var $=/WebKit/.test(navigator.userAgent)?-1:0;})()
diff --git a/src/core/collapse.js b/src/core/collapse.js
new file mode 100644
index 00000000..c34384e7
--- /dev/null
+++ b/src/core/collapse.js
@@ -0,0 +1,3 @@
+function d3_collapse(s) {
+  return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
+}
diff --git a/src/core/core.js b/src/core/core.js
index 89c3f1fa..24d42492 100644
--- a/src/core/core.js
+++ b/src/core/core.js
@@ -1 +1 @@
-d3 = {version: "0.26.1"}; // semver
+d3 = {version: "0.27.0"}; // semver
diff --git a/src/core/requote.js b/src/core/requote.js
new file mode 100644
index 00000000..a4ef92aa
--- /dev/null
+++ b/src/core/requote.js
@@ -0,0 +1,5 @@
+d3["requote"] = function(s) {
+  return s.replace(d3_requote_re, "\\$&");
+};
+
+var d3_requote_re = /[\\\^\$\*\+\?\[\]\(\)\.\{\}]/g;
diff --git a/src/core/selection.js b/src/core/selection.js
index 9f5facc8..cffccb02 100644
--- a/src/core/selection.js
+++ b/src/core/selection.js
@@ -292,6 +292,43 @@ function d3_selection(groups) {
         : (name.local ? attrConstantNS : attrConstant)));
   };
 
+  groups["classed"] = function(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) {
+      return first(function() {
+        return re.test(this.className);
+      });
+    }
+
+    /** @this {Element} */
+    function classedAdd() {
+      var classes = this.className;
+      if (!re.test(classes)) {
+        this.className = d3_collapse(classes + " " + name);
+      }
+    }
+
+    /** @this {Element} */
+    function classedRemove() {
+      var classes = d3_collapse(this.className.replace(re, " "));
+      this.className = classes.length ? classes : null;
+    }
+
+    /** @this {Element} */
+    function classedFunction() {
+      (value.apply(this, arguments)
+          ? classedAdd
+          : classedRemove).call(this);
+    }
+
+    return groups.each(typeof value == "function"
+        ? classedFunction : value
+        ? classedAdd
+        : classedRemove);
+  };
+
   groups.style = function(name, value, priority) {
     if (arguments.length < 3) priority = null;
 
@@ -438,7 +475,7 @@ function d3_selection(groups) {
   };
 
   groups.sort = function(comparator) {
-    comparator = d3_comparator.apply(this, arguments);
+    comparator = d3_selection_comparator.apply(this, arguments);
     for (var j = 0, m = groups.length; j < m; j++) {
       var group = groups[j];
       group.sort(comparator);
@@ -488,17 +525,9 @@ function d3_selection_join(key) {
   };
 }
 
-function d3_comparator(comparator) {
-  if (!arguments.length) comparator = d3_ascending;
+function d3_selection_comparator(comparator) {
+  if (!arguments.length) comparator = d3.ascending;
   return function(a, b) {
     return comparator(a && a.__data__, b && b.__data__);
   };
 }
-
-function d3_ascending(a, b) {
-  return a < b ? -1 : a > b ? 1 : 0;
-}
-
-function d3_descending(a, b) {
-  return a < b ? 1 : a > b ? -1 : 0;
-}