I'm trying to use bubble charts to plot a series of average times, using 
the standard deviation for the bubble size. 

I'm finding that the bubble size is not at all to scale with anything else 
in the chart. In the example below, I'd like the "Ron" bubble to be only 
10% larger than the "Harry" bubble. And the "Hermione" bubble should be 
only 50% bigger than the "Harry" bubble. For extra points, the size of the 
bubble should scale with the vertical units. 

    function drawSeriesChart() {

        var data = google.visualization.arrayToDataTable([
            ['ID', 'Sequence', 'Average Time (ms)', 'Iterations', 'Std 
Dev'],
            ['Harry', 1, 10, '222', 1],
            ['Ron', 2, 12, '199', 1.1],
            ['Hermione', 3, 16, '206', 1.5], ]);
        var options = {
            title: 'Gryphindor',
            legend: 'none',
            hAxis: {
                title: 'Data Source'
            },
            vAxis: {
                title: 'Average Time (ms)',
                viewWindowMode: 'pretty',
                minValue: 8,
                maxValue: 18
            }
        };

        var chart = new 
google.visualization.BubbleChart(document.getElementById('series_chart_div'));
        chart.draw(data, options);
    }

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