data.setValue(nextRow, 0, new Date(System.currentTimeMillis()));
data.setValue(nextRow, 1, usedMb);
Options options = createOptions();
AxisOptions vaxis = AxisOptions.create();
vaxis.setMaxValue(maxMb);
options.setVAxisOptions(vaxis);
AxisOptions haxis = AxisOptions.create();
haxis.set("showTextEvery", "25.00");
haxis.set("maxAlternation", "1");
options.setHAxisOptions(haxis);
chart.draw(data, options);
}