How many Y variables can be plotted on a graph?
Version 4.5 – A maximum of 99 Y variables can be plotted on a single plot, although there is a limit of 40 plot groups.
Version 4.1 and earlier – A maximum of 20 Y variables can be plotted on a single plot. To plot more than 20 variables, you could create two separate plots and overlay them in the layout window.
The one exception is the Pie chart which only permits one X and one Y variable.