[Gretl-devel] Q-Q plot, again

I'm starting to implement the normal Q-Q plot as a built-in command. Question: should we standardize the series to be plotted against the normal? I notice that R does not standardize, but neither does it draw a 45-degree line. If you don't standardize but do draw the 45-degree line, then you get quite odd-looking results for a series that has a substantially non-zero mean and/or a variance that differs substantially from 1. Allin.