Hold plotted curves

If this menu-item is checked, the existing curves in the plot(s) will remain in the plot when a new curve is plotted. If it is unchecked, the existing curves in the plot(s) will be deleted when a new curve is plotted. In the software MLSSA® and some other software holding plotted curves is called Overplot. Note that in WinMLS you may change the settings for the curves you have already plotted.