 20, group: 3},
    {x: '2014-06-27', y: 60, group: 3},
    {x: '2014-06-28', y: 10, group: 3},
    {x: '2014-06-29', y: 25, group: 3},
    {x: '2014-06-30', y: 30, group: 3}
  ];

  var dataset = new vis.DataSet(items);
  var options = {
      defaultGroup: 'ungrouped',
      legend: true,
      start: '2014-06-10',
      end: '2014-07-04'
  };
  var graph2d = new vis.Graph2d(container, dataset, groups, options);

</script>
</body>
</html>