-06-11', y: 22, group:2},
        {x: '2014-06-12', y: 14, group:2},
        {x: '2014-06-13', y: 24, group:2},
        {x: '2014-06-14', y: 21, group:2},
        {x: '2014-06-15', y: 30, group:2},
        {x: '2014-06-16', y: 18, group:2}
    ];

    var dataset = new vis.DataSet(items);
    var options = {
        style:'bar',
        barChart: {width:50, align:'center', sideBySide:true}, // align: left, center, right
        drawPoints: true,
        dataAxis: {
            left: {
                range: