diff --git a/data/example_data.tsv b/data/example_data.tsv
index a253f61..02a4f38 100644
--- a/data/example_data.tsv
+++ b/data/example_data.tsv
@@ -1726,4 +1726,4 @@ Date	Month	Channel	Owner	Brand	Pack Size	Pack Type	SKU	Price Tier	Unit Sales	Sal
 01/12/2012	Dec-12	Supermarkets	Tyrell Corp	Kappa	8	Standard	Kappa 8 Pack Standard	Regular	11263	703847	36.56	1788.2	62.49	702058.8	655473.24	46585.56	-10565	-625137	1.02	-1588.22	1.61	-623548.78	-582171.91	-41376.87
 01/12/2012	Dec-12	Supermarkets	Tyrell Corp	Kappa	12	Standard	Kappa 12 Pack Standard	Regular	4999	377208	39	958.34	75.46	376249.66	351283.18	24966.48	1864	128842	4.93	327.34	-3.76	128514.66	119986.56	8528.1
 01/12/2012	Dec-12	Supermarkets	Tyrell Corp	Kappa	18	Standard	Kappa 18 Pack Standard	Regular	5330	339454	31.78	862.42	63.69	338591.58	316124.13	22467.45	-1763	-103005	-0.35	-261.69	1.31	-102743.31	-95925.65	-6817.66
-01/12/2012	Dec-12	Supermarkets	Wayne Ent	Pi	12	Giftset	Pi 12 Pack Giftset	Regular	176	14269	5.97	36.25	81.07	14232.75	13288.51	944.24	4	-3	0.12	-0.01	-1.91	-2.99	-2.79	-0.2
+01/12/2012	Dec-12	Supermarkets	Wayne Ent	Pi	12	Giftset	Pi 12 Pack Giftset	Regular	176	14269	5.97	36.25	81.07	14232.75	13288.51	944.24	4	-3	0.12	-0.01	-1.91	-2.99	-2.79	-0.2
\ No newline at end of file
diff --git a/dist/dimple.v1.js b/dist/dimple.v1.js
index 2b024fb..c7bf10f 100644
--- a/dist/dimple.v1.js
+++ b/dist/dimple.v1.js
@@ -317,6 +317,10 @@ var dimple = {
 
         // The group within which to put all of this chart's objects
         this._group = svg.append("g");
+        // The group within which to put tooltips.  This is not initialised here because
+        // the group would end up behind other chart contents in a multi chart output.  It will
+        // therefore be added and removed by the mouse enter/leave events
+        this._tooltipGroup = null;
         // Colors assigned to chart contents.  E.g. a series value.
         this._assignedColors = {};
         // The next colour index to use, this value is cycled around for all default colours
@@ -1932,10 +1936,10 @@ var dimple = {
                     filter.push(d.aggField[k]);
                 }
                 uniqueValues.forEach(function (e) {
-                    match = match || (e.join("/") === filter.join("/"));
+                    match = match || (e === filter.join("/"));
                 }, this);
                 if (!match) {
-                    uniqueValues.push(filter);
+                    uniqueValues.push(filter.join("/"));
                 }
             }, this);
 
@@ -1963,7 +1967,7 @@ var dimple = {
                 .data(uniqueValues)
                 .transition()
                 .duration(duration)
-                .attr("class", function (d) { return "series area " + d.join("_").replace(" ", ""); })
+                .attr("class", function (d) { return "series area " + d.replace(" ", ""); })
                 .attr("d", function (d) {
                     var seriesData,
                         baseline = [],
@@ -2119,15 +2123,17 @@ var dimple = {
                 h = 0,
                 box,
                 overlap,
-                rows = [],
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                        .attr("class", "hoverShapes");
+                rows = [];
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // On hover make the line marker visible immediately
             selectedShape.style("opacity", 1);
             // Add a ring around the data point
-            g.append("circle")
+            chart._tooltipGroup.append("circle")
                 .attr("cx", cx)
                 .attr("cy", cy)
                 .attr("r", r)
@@ -2144,7 +2150,7 @@ var dimple = {
 
             // Add a drop line to the x axis
             if (dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", cx)
                     .attr("y1", (cy < dropDest.y ? cy + r + 4 : cy - r - 4))
                     .attr("x2", cx)
@@ -2163,7 +2169,7 @@ var dimple = {
 
             // Add a drop line to the y axis
             if (dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
                     .attr("y1", cy)
                     .attr("x2", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
@@ -2181,7 +2187,7 @@ var dimple = {
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -2279,10 +2285,9 @@ var dimple = {
         leaveEventHandler: function (e, shape, chart, series) {
             // Return the opacity of the marker
             d3.select(shape).style("opacity", (series.lineMarkers ? dimple._helpers.opacity(e, chart, series) : 0));
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };
 
@@ -2413,14 +2418,16 @@ var dimple = {
                 yRunning = 0,
                 // The maximum bounds of the text elements
                 w = 0,
-                h = 0,
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                    .attr("class", "hoverShapes");
+                h = 0;
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // Add a drop line to the x axis
             if (!series.x._hasCategories() && dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (x < series.x._origin ? x + 1 : x + width - 1))
                     .attr("y1", (y < dropDest.y ? y + height : y))
                     .attr("x2", (x < series.x._origin ? x + 1 : x + width - 1))
@@ -2439,7 +2446,7 @@ var dimple = {
 
             // Add a drop line to the y axis
             if (!series.y._hasCategories() && dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (x < dropDest.x ? x + width : x))
                     .attr("y1", (y < series.y._origin ? y + 1 : y + height - 1))
                     .attr("x2", (x < dropDest.x ? x + width : x))
@@ -2457,7 +2464,7 @@ var dimple = {
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -2566,10 +2573,9 @@ var dimple = {
 
         // Handle the mouse leave event
         leaveEventHandler: function (chart) {
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };
 
@@ -2697,13 +2703,15 @@ var dimple = {
                 // The maximum bounds of the text elements
                 w = 0,
                 h = 0,
-                overlap,
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                    .attr("class", "hoverShapes");
+                overlap;
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // Add a ring around the data point
-            g.append("circle")
+            chart._tooltipGroup.append("circle")
                 .attr("cx", cx)
                 .attr("cy", cy)
                 .attr("r", r)
@@ -2720,7 +2728,7 @@ var dimple = {
 
             // Add a drop line to the x axis
             if (dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", cx)
                     .attr("y1", (cy < dropDest.y ? cy + r + 4 : cy - r - 4))
                     .attr("x2", cx)
@@ -2739,7 +2747,7 @@ var dimple = {
 
             // Add a drop line to the y axis
             if (dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
                     .attr("y1", cy)
                     .attr("x2", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
@@ -2757,7 +2765,7 @@ var dimple = {
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -2853,10 +2861,9 @@ var dimple = {
 
         // Handle the mouse leave event
         leaveEventHandler: function (chart) {
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };
 
@@ -3062,16 +3069,18 @@ var dimple = {
                 t,
                 box,
                 rows = [],
-                overlap,
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                    .attr("class", "hoverShapes");
+                overlap;
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // On hover make the line marker visible immediately
             selectedShape.style("opacity", 1);
 
             // Add a ring around the data point
-            g.append("circle")
+            chart._tooltipGroup.append("circle")
                 .attr("cx", cx)
                 .attr("cy", cy)
                 .attr("r", r)
@@ -3088,7 +3097,7 @@ var dimple = {
 
             // Add a drop line to the x axis
             if (dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", cx)
                     .attr("y1", (cy < dropDest.y ? cy + r + series.lineWeight + 2 : cy - r - series.lineWeight - 2))
                     .attr("x2", cx)
@@ -3107,7 +3116,7 @@ var dimple = {
 
             // Add a drop line to the y axis
             if (dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (cx < dropDest.x ? cx + r + series.lineWeight + 2 : cx - r - series.lineWeight - 2))
                     .attr("y1", cy)
                     .attr("x2", (cx < dropDest.x ? cx + r + series.lineWeight + 2 : cx - r - series.lineWeight - 2))
@@ -3125,7 +3134,7 @@ var dimple = {
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -3223,10 +3232,9 @@ var dimple = {
         leaveEventHandler: function (e, shape, chart, series) {
             // Return the opacity of the marker
             d3.select(shape).style("opacity", (series.lineMarkers ? dimple._helpers.opacity(e, chart, series) : 0));
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };
 
diff --git a/dist/dimple.v1.min.js b/dist/dimple.v1.min.js
index 4ac5c78..0c6e045 100644
--- a/dist/dimple.v1.min.js
+++ b/dist/dimple.v1.min.js
@@ -1,2 +1,2 @@
-var dimple={version:"1.0.0",plot:{},aggregateMethod:{}};!function(){"use strict";dimple.axis=function(a,b,c,d){this.chart=a,this.position=b,this.categoryFields=c,this.measure=d,this.hidden=!1,this.showPercent=!1,this.colors=null,this.overrideMin=null,this.overrideMax=null,this.shapes=null,this.showGridlines=null,this.gridlineShapes=null,this.titleShape=null,this._scale=null,this._min=0,this._max=0,this._previousOrigin=null,this._origin=null,this._orderRules=[],this._groupOrderRules=[],this._draw=null,this._getFormat=function(){var a,b,c,d,e,f,g;return this.showPercent?a=d3.format("%"):null!==this.measure?(b=Math.floor(Math.abs(this._max),0).toString(),c=Math.floor(Math.abs(this._min),0).toString(),d=Math.max(c.length,b.length),d>3?(e=Math.min(Math.floor((d-1)/3),4),f="kmBT".substring(e-1,e),g=1>=d-3*e?1:0,a=function(a){return 0===a?0:d3.format(",."+g+"f")(a/Math.pow(1e3,e))+f}):(g=1>=d?1:0,a=d3.format(",."+g+"f"))):a=function(a){return a},a},this._hasCategories=function(){return null!==this.categoryFields&&void 0!==this.categoryFields&&this.categoryFields.length>0},this._hasMeasure=function(){return null!==this.measure&&void 0!==this.measure},this._update=function(a){var b,c,d,e,f=[],g=function(a,b,c){var d,e=a.categoryFields[0],f=e,g=!1,h=!0,i=[];for(d=0;d<a.chart.data.length;d+=1)if(isNaN(Date.parse(a.chart.data[d][e]))){h=!1;break}return h||a.chart.series.forEach(function(d){d[b]===a&&d[c]._hasMeasure()&&(f=d[c].measure,g=!0)},this),i=a._orderRules.concat({ordering:f,desc:g}),dimple._getOrderedList(a.chart.data,e,i)};if(this._min=this.showPercent&&this._min<-1?-1:this._min,this._max=this.showPercent&&this._max>1?1:this._max,this._min=null!==this.overrideMin?this.overrideMin:this._min,this._max=null!==this.overrideMax?this.overrideMax:this._max,this.position.length>0&&"x"===this.position[0]){if(null===this.measure||void 0===this.measure?(f=g(this,"x","y"),this._scale=d3.scale.ordinal().rangePoints([this.chart.x,this.chart.x+this.chart.width]).domain(f.concat([""]))):this._scale=d3.scale.linear().range([this.chart.x,this.chart.x+this.chart.width]).domain([this._min,this._max]).nice(),!this.hidden)switch(this.chart._axisIndex(this,"x")){case 0:this._draw=d3.svg.axis().orient("bottom").scale(this._scale);break;case 1:this._draw=d3.svg.axis().orient("top").scale(this._scale)}}else if(this.position.length>0&&"y"===this.position[0]){if(null===this.measure||void 0===this.measure?(f=g(this,"y","x"),this._scale=d3.scale.ordinal().rangePoints([this.chart.y+this.chart.height,this.chart.y]).domain(f.concat([""]))):this._scale=d3.scale.linear().range([this.chart.y+this.chart.height,this.chart.y]).domain([this._min,this._max]).nice(),!this.hidden)switch(this.chart._axisIndex(this,"y")){case 0:this._draw=d3.svg.axis().orient("left").scale(this._scale);break;case 1:this._draw=d3.svg.axis().orient("right").scale(this._scale)}}else this.position.length>0&&"z"===this.position[0]?this._scale=d3.scale.linear().range([this.chart.height/300,this.chart.height/10]).domain([this._min,this._max]):this.position.length>0&&"c"===this.position[0]&&(this._scale=d3.scale.linear().range([0,null===this.colors||1===this.colors.length?1:this.colors.length-1]).domain([this._min,this._max]));return(null===a||void 0===a||a===!1)&&null!==this._scale&&null!==this._scale.ticks&&void 0!==this._scale.ticks&&this._scale.ticks(10).length>0&&(b=this._scale.ticks(10),c=b[1]-b[0],d=((this._max-this._min)%c).toFixed(0),0!==d&&(this._max=Math.ceil(this._max/c)*c,this._min=Math.floor(this._min/c)*c,this._update(!0))),e=this._scale.copy()(0),this._origin!==e&&(this._previousOrigin=null===this._origin?e:this._origin,this._origin=e),this},this.addGroupOrderRule=function(a,b){this._groupOrderRules.push({ordering:a,desc:b})},this.addOrderRule=function(a,b){this._orderRules.push({ordering:a,desc:b})}},dimple.chart=function(a,b){this.svg=a,this.x=.1*a[0][0].width.baseVal.value,this.y=.1*a[0][0].height.baseVal.value,this.width=.8*a[0][0].width.baseVal.value,this.height=.8*a[0][0].height.baseVal.value,this.data=b,this.noFormats=!1,this.axes=[],this.series=[],this.legends=[],this.storyboard=null,this.titleShape=null,this.shapes=null,this._group=a.append("g"),this._assignedColors={},this._nextColor=0,this._axisIndex=function(a,b){var c=0,d=0,e=-1;for(c=0;c<this.axes.length;c+=1){if(this.axes[c]===a){e=d;break}(null===b||void 0===b||b[0]===this.axes[c].position[0])&&(d+=1)}return e},this._getSeriesData=function(){null!==this.series&&void 0!==this.series&&this.series.forEach(function(a){var b,c,d=[],e=function(a,b){var c=[];return null!==a&&a._hasCategories()&&a.categoryFields.forEach(function(a){c.push(b[a])},this),c},f={x:!1,y:!1,z:!1,c:!1},g={x:[],y:[]},h={x:[],y:[],z:[]},i={min:null,max:null},j={x:[],y:[],z:[]},k=[],l={},m={x:0,y:0,z:0},n="",o=[],p="",q=[],r="",s=[],t="",u=[],v=[],w=this.data,x=[];null!==this.storyboard&&void 0!==this.storyboard&&this.storyboard.categoryFields.length>0&&(n=this.storyboard.categoryFields[0],o=dimple._getOrderedList(this.data,n,this.storyboard._orderRules)),a.x._hasCategories()&&a.x._hasMeasure()&&(r=a.x.categoryFields[0],s=dimple._getOrderedList(this.data,r,a.x._orderRules.concat([{ordering:a.x.measure,desc:!0}]))),a.y._hasCategories()&&a.y._hasMeasure()&&(t=a.y.categoryFields[0],u=dimple._getOrderedList(this.data,t,a.y._orderRules.concat([{ordering:a.y.measure,desc:!0}]))),null!==a.categoryFields&&void 0!==a.categoryFields&&a.categoryFields.length>0&&(v=a._orderRules,p=a.categoryFields[0],null!==a.c&&void 0!==a.c&&a.c._hasMeasure()?v.push({ordering:a.c.measure,desc:!0}):null!==a.z&&void 0!==a.z&&a.z._hasMeasure()?v.push({ordering:a.z.measure,desc:!0}):a.x._hasMeasure()?v.push({ordering:a.x.measure,desc:!0}):a.y._hasMeasure()&&v.push({ordering:a.y.measure,desc:!0}),q=dimple._getOrderedList(this.data,p,v)),w.sort(function(a,b){var c=0;return""!==n&&(c=o.indexOf(a[n])-o.indexOf(b[n])),""!==r&&0===c&&(c=s.indexOf(a[r])-s.indexOf(b[r])),""!==t&&0===c&&(c=u.indexOf(a[t])-u.indexOf(b[t])),""!==p&&0===c&&(c=q.indexOf(a[p])-q.indexOf(b[p])),c}),w.forEach(function(b){var c,g,h,i,j=-1,k=e(a.x,b),l=e(a.y,b),m=e(a.z,b),n=[];for(null===a.categoryFields||void 0===a.categoryFields||0===a.categoryFields.length?n=["All"]:1===a.categoryFields.length&&void 0===b[a.categoryFields[0]]?n=[a.categoryFields[0]]:a.categoryFields.forEach(function(a){n.push(b[a])},this),c=n.join("/")+"_"+k.join("/")+"_"+l.join("/")+"_"+m.join("/"),g=0;g<d.length;g+=1)if(d[g].key===c){j=g;break}-1===j&&(h={key:c,aggField:n,xField:k,xValue:null,xCount:0,yField:l,yValue:null,yCount:0,zField:m,zValue:null,zCount:0,cValue:0,cCount:0,x:0,y:0,xOffset:0,yOffset:0,width:0,height:0,cx:0,cy:0,xBound:0,yBound:0,xValueList:[],yValueList:[],zValueList:[],cValueList:[],fill:{},stroke:{}},d.push(h),j=d.length-1),i=function(c,e){var g,h,i=!0,k={value:0,count:1},l={value:0,count:1},m="";null!==e&&(g=e.getFrameValue(),e.categoryFields.forEach(function(a,c){c>0&&(m+="/"),m+=b[a],i=m===g},this)),null!==c&&void 0!==c&&null!==c.measure&&void 0!==c.measure&&i&&(h=d[j],-1===h[c.position+"ValueList"].indexOf(b[c.measure])&&h[c.position+"ValueList"].push(b[c.measure]),isNaN(parseFloat(b[c.measure]))&&(f[c.position]=!0),k.value=h[c.position+"Value"],k.count=h[c.position+"Count"],l.value=b[c.measure],h[c.position+"Value"]=a.aggregate(k,l),h[c.position+"Count"]+=1)},i(a.x,this.storyboard),i(a.y,this.storyboard),i(a.z,this.storyboard),i(a.c,this.storyboard)},this),null!==a.x&&void 0!==a.x&&a.x._hasCategories()&&a.x.categoryFields.length>1&&void 0!==g.x&&(x=[],a.y._hasMeasure()&&x.push({ordering:a.y.measure,desc:!0}),g.x=dimple._getOrderedList(this.data,a.x.categoryFields[1],a.x._groupOrderRules.concat(x))),null!==a.y&&void 0!==a.y&&a.y._hasCategories()&&a.y.categoryFields.length>1&&void 0!==g.y&&(x=[],a.x._hasMeasure()&&x.push({ordering:a.x.measure,desc:!0}),g.y=dimple._getOrderedList(this.data,a.y.categoryFields[1],a.y._groupOrderRules.concat(x)),g.y.reverse()),d.forEach(function(c){null!==a.x&&(f.x===!0&&(c.xValue=c.xValueList.length),b=(null===h.x[c.xField.join("/")]||void 0===h.x[c.xField.join("/")]?0:h.x[c.xField.join("/")])+(a.y._hasMeasure()?Math.abs(c.yValue):0),h.x[c.xField.join("/")]=b),null!==a.y&&(f.y===!0&&(c.yValue=c.yValueList.length),b=(null===h.y[c.yField.join("/")]||void 0===h.y[c.yField.join("/")]?0:h.y[c.yField.join("/")])+(a.x._hasMeasure()?Math.abs(c.xValue):0),h.y[c.yField.join("/")]=b),null!==a.z&&(f.z===!0&&(c.zValue=c.zValueList.length),b=(null===h.z[c.zField.join("/")]||void 0===h.z[c.zField.join("/")]?0:h.z[c.zField.join("/")])+(a.z._hasMeasure()?Math.abs(c.zValue):0),h.z[c.zField.join("/")]=b),null!==a.c&&((null===i.min||c.cValue<i.min)&&(i.min=c.cValue),(null===i.max||c.cValue>i.max)&&(i.max=c.cValue))},this);for(c in 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this.x=a,this.y=b,this.width=c,this.height=d,this.axes.forEach(function(a){a._update()},this),this},this.setStoryboard=function(a,b){return this.storyboard=new dimple.storyboard(this,a),null!==b&&void 0!==b&&(this.storyboard.onTick=b),this.storyboard}},dimple.color=function(a,b,c){this.fill=a,this.stroke=null===b||void 0===b?d3.rgb(a).darker(.5).toString():b,this.opacity=null===c||void 0===c?.8:c},dimple.eventArgs=function(){this.seriesValue=null,this.xValue=null,this.yValue=null,this.zValue=null,this.colorValue=null,this.frameValue=null,this.seriesShapes=null,this.selectedShape=null},dimple.legend=function(a,b,c,d,e,f,g){this.chart=a,this.series=g,this.x=b,this.y=c,this.width=d,this.height=e,this.horizontalAlign=f,this.shapes=null,this._draw=function(a){var b,c=this._getEntries(),d=0,e=0,f=0,g=0,h=15,i=9,j=this;null!==this.shapes&&void 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j.y+g+this.getBBox().height/1.65}).attr("width",j.width).attr("height",j.height),d3.select(this).select("rect").attr("class","legend legendKey").attr("x","left"===j.horizontalAlign?j.x+f:j.x+(j.width-f-d)).attr("y",j.y+g).attr("height",i).attr("width",h).style("fill",function(){return dimple._helpers.fill(a,j.chart,a.series)}).style("stroke",function(){return dimple._helpers.stroke(a,j.chart,a.series)}).style("opacity",function(){return dimple._helpers.opacity(a,j.chart,a.series)}).style("shape-rendering","crispEdges"),f+=d)}),b.transition().delay(.2*a).duration(.8*a).attr("opacity",1),this.shapes=b},this._getEntries=function(){var a=[];return null!==this.series&&void 0!==this.series&&this.series.forEach(function(b){var c=b._positionData;c.forEach(function(c){var d,e=-1;for(d=0;d<a.length;d+=1)if(a[d].key===c.aggField.slice(-1)[0]){e=d;break}-1===e&&(a.push({key:c.aggField.slice(-1)[0],fill:c.fill,stroke:c.stroke,series:b,aggField:c.aggField}),e=a.length-1)})},this),a}},dimple.series=function(a,b,c,d,e,f,g,h,i){this.chart=a,this.x=c,this.y=d,this.z=e,this.c=f,this.plot=g,this.categoryFields=b,this.aggregate=h,this.stacked=i,this.barGap=.2,this.clusterBarGap=.1,this.lineWeight=2,this.lineMarkers=!1,this._eventHandlers=[],this._positionData=[],this._orderRules=[],this._axisBounds=function(a){var b,c,d,e={min:0,max:0},f=null,g=null,h=[],i=0,j=this._positionData;return"x"===a?(f=this.x,g=this.y):"y"===a?(f=this.y,g=this.x):"z"===a?f=this.z:"c"===a&&(f=this.c),f.showPercent?j.forEach(function(a){a[f.position+"Bound"]<e.min&&(e.min=a[f.position+"Bound"]),a[f.position+"Bound"]>e.max&&(e.max=a[f.position+"Bound"])},this):null===g||null===g.categoryFields||0===g.categoryFields.length?j.forEach(function(a){!this.stacked||"x"!==f.position&&"y"!==f.position?(a[f.position+"Value"]<e.min&&(e.min=a[f.position+"Value"]),a[f.position+"Value"]>e.max&&(e.max=a[f.position+"Value"])):a[f.position+"Value"]<0?e.min=e.min+a[f.position+"Value"]:e.max=e.max+a[f.position+"Value"]},this):(b=f.position+"Value",c=g.position+"Field",d=[],j.forEach(function(a){var e=a[c].join("/"),f=d.indexOf(e);-1===f&&(d.push(e),f=d.length-1),void 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0!==c.y.measure?Math.abs(c.y._scale(0)-c.y._scale(a.height)):a.height*(b.height/c.y._max-2*dimple._helpers.yGap(b,c))-2*dimple._helpers.yClusterGap(a,b,c)},opacity:function(a,b,c){var d=0;return d=null!==c.c&&void 0!==c.c?a.opacity:b.getColor(a.aggField.slice(-1)[0]).opacity},fill:function(a,b,c){var d=0;return d=null!==c.c&&void 0!==c.c?a.fill:b.getColor(a.aggField.slice(-1)[0]).fill},stroke:function(a,b,c){var d=0;return d=null!==c.c&&void 0!==c.c?a.stroke:b.getColor(a.aggField.slice(-1)[0]).stroke}},dimple._rollUp=function(a,b,c){var d=[];return b=null!==b&&void 0!==b?[].concat(b):[],a.forEach(function(a){var e=-1,f={},g=!0;d.forEach(function(c,d){-1===e&&(g=!0,b.forEach(function(b){g=g&&a[b]===c[b]},this),g&&(e=d))},this),-1!==e?f=d[e]:(b.forEach(function(b){f[b]=a[b]},this),d.push(f),e=d.length-1),c.forEach(function(c){-1===b.indexOf(c)&&(void 0===f[c]&&(f[c]=[]),f[c]=f[c].concat(a[c]))},this),d[e]=f},this),d},dimple.filterData=function(a,b,c){var d=a;return null!==b&&null!==c&&(null!==c&&void 0!==c&&(c=[].concat(c)),d=[],a.forEach(function(a){null===a[b]?d.push(a):c.indexOf([].concat(a[b]).join("/"))>-1&&d.push(a)},this)),d},dimple.getUniqueValues=function(a,b){var c=[];return null!==b&&void 0!==b&&(b=[].concat(b),a.forEach(function(a){var d="";b.forEach(function(b,c){c>0&&(d+="/"),d+=a[b]},this),-1===c.indexOf(d)&&c.push(d)},this)),c},dimple.newSvg=function(a,b,c){var d=null;if((null===a||void 0===a)&&(a="body"),d=d3.select(a),d.empty())throw"The '"+a+"' selector did not match any elements.  Please prefix with '#' to select by id or '.' to select by class";return d.append("svg").attr("width",b).attr("height",c)}}();
\ No newline at end of file
diff --git a/examples/advanced_trellis_bar.html b/examples/advanced_trellis_bar.html
index d3105b2..3b45b58 100644
--- a/examples/advanced_trellis_bar.html
+++ b/examples/advanced_trellis_bar.html
@@ -9,29 +9,24 @@
       var months = dimple.getUniqueValues(data, "Date");
 
       // Set the bounds for the charts
-      var row = 2,
-          col = 3,
+      var row = 0,
+          col = 0,
           top = 25,
           left = 60,
           inMarg = 15,
           width = 115,
           height = 90;
 
-      // Sort the months in descending order so that when tooltips are drawn
-      // they won't be behind the chart on the right.  This is because all
-      // chart shapes (including tooltips) are grouped.
-      months.sort(function (a, b) { return Date.parse(b) - Date.parse(a); });
-
       // Pick the latest 12 dates
-      months = months.slice(0, 12);
+      months = months.slice(months.length - 12);
 
       // Draw a chart for each of the 12 dates
       months.forEach(function (month) {
           
           // Wrap to the row above
-          if (col < 0) {
-            row -= 1;
-            col = 3;
+          if (left + ((col + 1) * (width + inMarg)) > parseFloat(svg.attr("width"))) {
+            row += 1;
+            col = 0;
           }
           
           // Filter for the month in the iteration
@@ -88,7 +83,7 @@
           x.titleShape.remove();
 
           // Move to the next column
-          col -= 1;
+          col += 1;
 
       }, this);
     });
diff --git a/src/objects/chart/begin.js b/src/objects/chart/begin.js
index 4ddde22..62e1015 100644
--- a/src/objects/chart/begin.js
+++ b/src/objects/chart/begin.js
@@ -33,6 +33,10 @@
 
         // The group within which to put all of this chart's objects
         this._group = svg.append("g");
+        // The group within which to put tooltips.  This is not initialised here because
+        // the group would end up behind other chart contents in a multi chart output.  It will
+        // therefore be added and removed by the mouse enter/leave events
+        this._tooltipGroup = null;
         // Colors assigned to chart contents.  E.g. a series value.
         this._assignedColors = {};
         // The next colour index to use, this value is cycled around for all default colours
diff --git a/src/objects/plot/area.js b/src/objects/plot/area.js
index f664b66..68ea5f0 100644
--- a/src/objects/plot/area.js
+++ b/src/objects/plot/area.js
@@ -30,10 +30,10 @@
                     filter.push(d.aggField[k]);
                 }
                 uniqueValues.forEach(function (e) {
-                    match = match || (e.join("/") === filter.join("/"));
+                    match = match || (e === filter.join("/"));
                 }, this);
                 if (!match) {
-                    uniqueValues.push(filter);
+                    uniqueValues.push(filter.join("/"));
                 }
             }, this);
 
@@ -61,7 +61,7 @@
                 .data(uniqueValues)
                 .transition()
                 .duration(duration)
-                .attr("class", function (d) { return "series area " + d.join("_").replace(" ", ""); })
+                .attr("class", function (d) { return "series area " + d.replace(" ", ""); })
                 .attr("d", function (d) {
                     var seriesData,
                         baseline = [],
@@ -217,15 +217,17 @@
                 h = 0,
                 box,
                 overlap,
-                rows = [],
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                        .attr("class", "hoverShapes");
+                rows = [];
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // On hover make the line marker visible immediately
             selectedShape.style("opacity", 1);
             // Add a ring around the data point
-            g.append("circle")
+            chart._tooltipGroup.append("circle")
                 .attr("cx", cx)
                 .attr("cy", cy)
                 .attr("r", r)
@@ -242,7 +244,7 @@
 
             // Add a drop line to the x axis
             if (dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", cx)
                     .attr("y1", (cy < dropDest.y ? cy + r + 4 : cy - r - 4))
                     .attr("x2", cx)
@@ -261,7 +263,7 @@
 
             // Add a drop line to the y axis
             if (dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
                     .attr("y1", cy)
                     .attr("x2", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
@@ -279,7 +281,7 @@
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -377,10 +379,9 @@
         leaveEventHandler: function (e, shape, chart, series) {
             // Return the opacity of the marker
             d3.select(shape).style("opacity", (series.lineMarkers ? dimple._helpers.opacity(e, chart, series) : 0));
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };
 
diff --git a/src/objects/plot/bar.js b/src/objects/plot/bar.js
index 4345f03..101c494 100644
--- a/src/objects/plot/bar.js
+++ b/src/objects/plot/bar.js
@@ -124,14 +124,16 @@
                 yRunning = 0,
                 // The maximum bounds of the text elements
                 w = 0,
-                h = 0,
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                    .attr("class", "hoverShapes");
+                h = 0;
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // Add a drop line to the x axis
             if (!series.x._hasCategories() && dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (x < series.x._origin ? x + 1 : x + width - 1))
                     .attr("y1", (y < dropDest.y ? y + height : y))
                     .attr("x2", (x < series.x._origin ? x + 1 : x + width - 1))
@@ -150,7 +152,7 @@
 
             // Add a drop line to the y axis
             if (!series.y._hasCategories() && dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (x < dropDest.x ? x + width : x))
                     .attr("y1", (y < series.y._origin ? y + 1 : y + height - 1))
                     .attr("x2", (x < dropDest.x ? x + width : x))
@@ -168,7 +170,7 @@
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -277,10 +279,9 @@
 
         // Handle the mouse leave event
         leaveEventHandler: function (chart) {
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };
 
diff --git a/src/objects/plot/bubble.js b/src/objects/plot/bubble.js
index 6432741..43fb4f5 100644
--- a/src/objects/plot/bubble.js
+++ b/src/objects/plot/bubble.js
@@ -121,13 +121,15 @@
                 // The maximum bounds of the text elements
                 w = 0,
                 h = 0,
-                overlap,
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                    .attr("class", "hoverShapes");
+                overlap;
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // Add a ring around the data point
-            g.append("circle")
+            chart._tooltipGroup.append("circle")
                 .attr("cx", cx)
                 .attr("cy", cy)
                 .attr("r", r)
@@ -144,7 +146,7 @@
 
             // Add a drop line to the x axis
             if (dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", cx)
                     .attr("y1", (cy < dropDest.y ? cy + r + 4 : cy - r - 4))
                     .attr("x2", cx)
@@ -163,7 +165,7 @@
 
             // Add a drop line to the y axis
             if (dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
                     .attr("y1", cy)
                     .attr("x2", (cx < dropDest.x ? cx + r + 4 : cx - r - 4))
@@ -181,7 +183,7 @@
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -277,10 +279,9 @@
 
         // Handle the mouse leave event
         leaveEventHandler: function (chart) {
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };
 
diff --git a/src/objects/plot/line.js b/src/objects/plot/line.js
index 767a727..d0732b9 100644
--- a/src/objects/plot/line.js
+++ b/src/objects/plot/line.js
@@ -199,16 +199,18 @@
                 t,
                 box,
                 rows = [],
-                overlap,
-                // Create a group for the hover objects
-                g = chart._group.append("g")
-                    .attr("class", "hoverShapes");
+                overlap;
+
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
+            chart._tooltipGroup = chart.svg.append("g");
 
             // On hover make the line marker visible immediately
             selectedShape.style("opacity", 1);
 
             // Add a ring around the data point
-            g.append("circle")
+            chart._tooltipGroup.append("circle")
                 .attr("cx", cx)
                 .attr("cy", cy)
                 .attr("r", r)
@@ -225,7 +227,7 @@
 
             // Add a drop line to the x axis
             if (dropDest.y !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", cx)
                     .attr("y1", (cy < dropDest.y ? cy + r + series.lineWeight + 2 : cy - r - series.lineWeight - 2))
                     .attr("x2", cx)
@@ -244,7 +246,7 @@
 
             // Add a drop line to the y axis
             if (dropDest.x !== null) {
-                g.append("line")
+                chart._tooltipGroup.append("line")
                     .attr("x1", (cx < dropDest.x ? cx + r + series.lineWeight + 2 : cx - r - series.lineWeight - 2))
                     .attr("y1", cy)
                     .attr("x2", (cx < dropDest.x ? cx + r + series.lineWeight + 2 : cx - r - series.lineWeight - 2))
@@ -262,7 +264,7 @@
             }
 
             // Add a group for text
-            t = g.append("g");
+            t = chart._tooltipGroup.append("g");
             // Create a box for the popup in the text group
             box = t.append("rect");
 
@@ -360,10 +362,9 @@
         leaveEventHandler: function (e, shape, chart, series) {
             // Return the opacity of the marker
             d3.select(shape).style("opacity", (series.lineMarkers ? dimple._helpers.opacity(e, chart, series) : 0));
-            // Clear all hover shapes
-            chart._group
-                .selectAll(".hoverShapes")
-                .remove();
+            if (chart._tooltipGroup !== null && chart._tooltipGroup !== undefined) {
+                chart._tooltipGroup.remove();
+            }
         }
     };