/*
 Highcharts JS v4.1.5 (2015-04-13)

 (c) 2014 Highsoft AS
 Authors: Jon Arild Nygard / Oystein Moseng

 License: www.highcharts.com/license
*/
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this.nodeMap[a.parent]:this.nodeMap[""]);if(a!==null)this.drillToNode(a.id),a.id===""?this.drillUpButton=this.drillUpButton.destroy():(a=this.nodeMap[a.parent],this.showDrillUpButton(a.name||a.id))},drillToNode:function(a){var b=this.nodeMap[a].values;this.rootNode=a;this.xAxis.setExtremes(b.x,b.x+b.width,!1);this.yAxis.setExtremes(b.y,b.y+b.height,!1);this.isDirty=!0;this.chart.redraw()},showDrillUpButton:function(a){var b=this,a=a||"< Back",c=b.options.drillUpButton,d,e;if(c.text)a=c.text;this.drillUpButton?
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