diff --git a/d3.js b/d3.js
index f084a51a..75f9541a 100644
--- a/d3.js
+++ b/d3.js
@@ -1,4 +1,4 @@
-d3 = {version: "0.25.0"}; // semver
+d3 = {version: "0.25.1"}; // semver
 if (!Date.now) Date.now = function() {
   return +new Date();
 };
@@ -2101,45 +2101,41 @@ d3["svg"]["chord"] = function() {
   // TODO Allow control point to be customized.
 
   function chord(d, i) {
-    var s = source.call(this, d, i),
-        t = target.call(this, d, i),
-        r0 = radius.call(this, s, i),
-        a00 = startAngle.call(this, s, i) + d3_svg_arcOffset,
-        a01 = endAngle.call(this, s, i) + d3_svg_arcOffset,
-        r1 = radius.call(this, t, i),
-        a10 = startAngle.call(this, t, i) + d3_svg_arcOffset,
-        a11 = endAngle.call(this, t, i) + d3_svg_arcOffset;
-    return (a00 == a10) && (a01 == a11) && (r0 == r1)
-      ? chord1(r0, a00, a01)
-      : chord2(r0, a00, a01, r1, a10, a11);
+    var s = subgroup(this, source, d, i),
+        t = subgroup(this, target, d, i);
+    return "M" + s.p0
+      + arc(s.r, s.p1) + (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)
+      + curve(t.r, t.p1, s.r, s.p0))
+      + "Z";
   }
 
-  function chord1(r0, a00, a01) {
-    var x00 = r0 * Math.cos(a00),
-        y00 = r0 * Math.sin(a00),
-        x01 = r0 * Math.cos(a01),
-        y01 = r0 * Math.sin(a01);
-    return "M" + x00 + "," + y00
-        + "A" + r0 + "," + r0 + " 0  0,1 " + x01 + "," + y01
-        + "Q 0,0 " + x00 + "," + y00
-        + "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 chord2(r0, a00, a01, r1, a10, a11) {
-    var x00 = r0 * Math.cos(a00),
-        y00 = r0 * Math.sin(a00),
-        x01 = r0 * Math.cos(a01),
-        y01 = r0 * Math.sin(a01),
-        x10 = r1 * Math.cos(a10),
-        y10 = r1 * Math.sin(a10),
-        x11 = r1 * Math.cos(a11),
-        y11 = r1 * Math.sin(a11);
-    return "M" + x00 + "," + y00
-        + "A" + r0 + "," + r0 + " 0  0,1 " + x01 + "," + y01
-        + "Q 0,0 " + x10 + "," + y10
-        + "A" + r1 + "," + r1 + " 0  0,1 " + x11 + "," + y11
-        + "Q 0,0 " + x00 + "," + y00
-        + "Z";
+  function equals(a, b) {
+    return a.a0 == b.a0 && a.a1 == b.a1;
+  }
+
+  function arc(r, p) {
+    return "A" + r + "," + r + " 0 0,1 " + p;
+  }
+
+  function curve(r0, p0, r1, p1) {
+    return "Q 0,0 " + p1;
   }
 
   chord["radius"] = function(v) {
diff --git a/d3.min.js b/d3.min.js
index 8140e302..ad27bfe7 100644
--- a/d3.min.js
+++ b/d3.min.js
@@ -1,62 +1,61 @@
-(function(){var q=null;d3={version:"0.25.0"};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 w(a){return Array.prototype.slice.call(a)}function x(a){return typeof a=="function"?a:function(){return a}}d3.merge=function(a){return Array.prototype.concat.apply([],a)};
-d3.split=function(a,b){var e=[],f=[],c,d=-1,g=a.length;if(arguments.length<2)b=aa;for(;++d<g;)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==q}function E(a,b){b=w(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==q)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.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:q)};f.send(q)};d3.json=function(a,b){return d3.text(a,"application/json",function(e){b(e&&JSON.parse(e))})};
+(function(){var o=null;d3={version:"0.25.1"};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 w(a){return Array.prototype.slice.call(a)}function x(a){return typeof a=="function"?a:function(){return a}}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=w(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.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].d==e)return a;b.push({d:e,on:true});return a};a.remove=function(e){for(var f=0;f<b.length;f++){var c=b[f];if(c.d==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.d.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],g=a[9];if(d)d=d.substring(1);if(e)b="0";if(g=="d")d="0";return function(h){if(g=="d"&&h%1)return"";if(d)h=(+h).toFixed(d);else h+="";if(c){for(var i=h.lastIndexOf("."),j=i>=0?h.substring(i):(i=h.length,""),l=[];i>0;)l.push(h.substring(i-=3,i+3));h=l.reverse().join(",")+j}i=h.length;if(i<f)h=Array(f-i+1).join(b)+h;return h}};
+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(q,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=q;
+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.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=[],g=[],h,i;for(f=0;e=H.exec(b);++f){e.index&&d.push(b.substring(c,e.index));g.push({a:d.length,x:e[0]});d.push(q);c=H.lastIndex}c<b.length&&d.push(b.substring(c));f=0;for(h=g.length;(e=H.exec(a))&&f<h;++f){i=g[f];if(i.x==e[0]){if(i.a)if(d[i.a+1]==q){d[i.a-1]+=i.x;d.splice(i.a,1);for(e=f+1;e<h;++e)g[e].a--}else{d[i.a-1]+=i.x+d[i.a+1];d.splice(i.a,2);for(e=f+1;e<h;++e)g[e].a-=2}else if(d[i.a+1]==q)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<h;++e)g[e].a--}g.splice(f,1);h--;f--}else i.x=d3.interpolateNumber(parseFloat(e[0]),parseFloat(i.x))}for(;f<h;){i=g.pop();if(d[i.a+1]==q)d[i.a]=i.x;else{d[i.a]=i.x+d[i.a+1];d.splice(i.a+1,1)}h--}if(d.length==1)return d[0]==q?g[0].x:function(){return b};return function(j){for(f=0;f<h;++f)d[(i=g[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,g=b.g-f,h=b.b-c;return function(i){return"rgb("+Math.round(e+d*i)+","+Math.round(f+g*i)+","+Math.round(c+h*i)+")"}};d3.interpolateArray=function(a,b){var e=[],f=[],c=a.length,d=b.length,g=Math.min(a.length,b.length),h;for(h=0;h<g;++h)e.push(d3.interpolate(a[h],b[h]));for(;h<c;++h)f[h]=a[h];for(;h<d;++h)f[h]=b[h];return function(i){for(h=0;h<g;++h)f[h]=e[h](i);return f}};
+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)}
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-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,g=(c+f)/2;if(d){f=g<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,g)}function L(a){var b=parseFloat(a);return a.charAt(a.length-1)=="%"?Math.round(b*2.55):b}
+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,
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-d3.svg.chord=function(){function a(g,h){var i=b.call(this,g,h),j=e.call(this,g,h),l=f.call(this,i,h),n=c.call(this,i,h)+V;i=d.call(this,i,h)+V;var p=f.call(this,j,h),k=c.call(this,j,h)+V;j=d.call(this,j,h)+V;if(n==k&&i==j&&l==p){p=l*Math.cos(n);n=l*Math.sin(n);l="M"+p+","+n+"A"+l+","+l+" 0  0,1 "+l*Math.cos(i)+","+l*Math.sin(i)+"Q 0,0 "+p+","+n+"Z"}else{var o=l*Math.cos(n);n=l*Math.sin(n);l="M"+o+","+n+"A"+l+","+l+" 0  0,1 "+l*Math.cos(i)+","+l*Math.sin(i)+"Q 0,0 "+p*Math.cos(k)+","+p*Math.sin(k)+
-"A"+p+","+p+" 0  0,1 "+p*Math.cos(j)+","+p*Math.sin(j)+"Q 0,0 "+o+","+n+"Z"}return l}var b=Ua,e=Va,f=Wa,c=Ka,d=La;a.radius=function(g){if(!arguments.length)return f;f=x(g);return a};a.source=function(g){if(!arguments.length)return b;b=x(g);return a};a.target=function(g){if(!arguments.length)return e;e=x(g);return a};a.startAngle=function(g){if(!arguments.length)return c;c=x(g);return a};a.endAngle=function(g){if(!arguments.length)return d;d=x(g);return a};return a};
-function Ua(a){return a.source}function Va(a){return a.target}function Wa(a){return a.radius}
+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=x(g);return a};a.source=
+function(g){if(!arguments.length)return e;e=x(g);return a};a.target=function(g){if(!arguments.length)return f;f=x(g);return a};a.startAngle=function(g){if(!arguments.length)return d;d=x(g);return a};a.endAngle=function(g){if(!arguments.length)return h;h=x(g);return a};return a};function Ua(a){return a.source}function Va(a){return a.target}function Wa(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/core.js b/src/core/core.js
index fa4e9204..37de2e91 100644
--- a/src/core/core.js
+++ b/src/core/core.js
@@ -1 +1 @@
-d3 = {version: "0.25.0"}; // semver
+d3 = {version: "0.25.1"}; // semver
diff --git a/src/svg/chord.js b/src/svg/chord.js
index 4213658b..4ad77180 100644
--- a/src/svg/chord.js
+++ b/src/svg/chord.js
@@ -8,45 +8,41 @@ d3["svg"]["chord"] = function() {
   // TODO Allow control point to be customized.
 
   function chord(d, i) {
-    var s = source.call(this, d, i),
-        t = target.call(this, d, i),
-        r0 = radius.call(this, s, i),
-        a00 = startAngle.call(this, s, i) + d3_svg_arcOffset,
-        a01 = endAngle.call(this, s, i) + d3_svg_arcOffset,
-        r1 = radius.call(this, t, i),
-        a10 = startAngle.call(this, t, i) + d3_svg_arcOffset,
-        a11 = endAngle.call(this, t, i) + d3_svg_arcOffset;
-    return (a00 == a10) && (a01 == a11) && (r0 == r1)
-      ? chord1(r0, a00, a01)
-      : chord2(r0, a00, a01, r1, a10, a11);
+    var s = subgroup(this, source, d, i),
+        t = subgroup(this, target, d, i);
+    return "M" + s.p0
+      + arc(s.r, s.p1) + (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)
+      + curve(t.r, t.p1, s.r, s.p0))
+      + "Z";
   }
 
-  function chord1(r0, a00, a01) {
-    var x00 = r0 * Math.cos(a00),
-        y00 = r0 * Math.sin(a00),
-        x01 = r0 * Math.cos(a01),
-        y01 = r0 * Math.sin(a01);
-    return "M" + x00 + "," + y00
-        + "A" + r0 + "," + r0 + " 0  0,1 " + x01 + "," + y01
-        + "Q 0,0 " + x00 + "," + y00
-        + "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 chord2(r0, a00, a01, r1, a10, a11) {
-    var x00 = r0 * Math.cos(a00),
-        y00 = r0 * Math.sin(a00),
-        x01 = r0 * Math.cos(a01),
-        y01 = r0 * Math.sin(a01),
-        x10 = r1 * Math.cos(a10),
-        y10 = r1 * Math.sin(a10),
-        x11 = r1 * Math.cos(a11),
-        y11 = r1 * Math.sin(a11);
-    return "M" + x00 + "," + y00
-        + "A" + r0 + "," + r0 + " 0  0,1 " + x01 + "," + y01
-        + "Q 0,0 " + x10 + "," + y10
-        + "A" + r1 + "," + r1 + " 0  0,1 " + x11 + "," + y11
-        + "Q 0,0 " + x00 + "," + y00
-        + "Z";
+  function equals(a, b) {
+    return a.a0 == b.a0 && a.a1 == b.a1;
+  }
+
+  function arc(r, p) {
+    return "A" + r + "," + r + " 0 0,1 " + p;
+  }
+
+  function curve(r0, p0, r1, p1) {
+    return "Q 0,0 " + p1;
   }
 
   chord["radius"] = function(v) {