private void Plot(Chart chart, Snapshot snapshot, string area)
{
var xvals = snapshot.Select(x => x.Timestamp).ToArray();
var yvals = new double?[0];
if (xvals.Length != 0)
{
for (int i = 0; i < snapshot[0].Labels.Count; i++)
{
yvals = snapshot.Select(y => y.Data[i].HasValue ? new double?(y.Data[i].Value*_scale) : null).ToArray();
AddSeriesToChart(chart, xvals, yvals, _min, _max, snapshot[0].Labels[i], area);
}
}
}