aset.

</div>
<br />
<div id="Legend" class="external-legend"></div>
<div id="visualization"></div>


<script type="text/javascript">
  // create a dataSet with groups
  var names = ['SquareShaded', 'Bargraph', 'Blank', 'CircleShaded'];
  var groups = new vis.DataSet();
  groups.add({
    id: 0,
    content: names[0],
    className: 'custom-style1',
    options: {
      drawPoints: {
        style: 'square' // square, circle
      },
      shaded: {
        orientation: 'bottom' // top, bottom
      }
    }