private string PlotSubtitle()
{
return mlog.Cpi.ToString() + " cpi" + (dual ? " vs. " + mlog2.Cpi.ToString() + " cpi" + " & " + numericUpDownDelay.Value.ToString("+#.#;-#.#;0", CultureInfo.InvariantCulture) + " ms delay" : "");
}