var chart = new google.visualization.LineChart(elem);
          var options = {
            title: title,
            curveType: 'function',
            pointSize: 4,
            vAxis: {title: vAxis},
            trendlines: {
              0: {
                pointSize: 0,
                type: 'linear',
                color: 'green',
                lineWidth: 3,
                vAxis: {title: vAxis},
                opacity: 0.5,
                showR2: true,
                visibleInLegend: false
   