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<head> <link rel='stylesheet' href="https://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css"> <script src='https://ramnathv.github.io/rCharts/libraries/widgets/polycharts/js/polychart2.standalone.js' type='text/javascript'></script> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.min.js"></script> <style> .rChart { display: block margin: auto auto; width: 100%; height: 400px; } .bs-docs-example:after { content: ""; background: transparent; border: none; } </style> </head> <body ng-app> <div class='container' ng-controller="DemoCtrl" ng-init="drawChart()"> <div class='row'> <div class='col-md-3'> <form class='well'> <label><b>Select x :</b></label> <select class='form-control' ng-model="opts.x.var" ng-options="ctl for ctl in controls.x.values"> </select><br> <label><b>Select y :</b></label> <select class='form-control' ng-model="opts.y.var" 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