A reader named Felix posted a comment on the blog, asking how he could make a line chart which has two time series, in which each time series has data for
Grace is a WYSIWYG 2D plotting tool for the X Window System and M*tif. Grace runs on practically any version of Unix-like OS. As well, it has been successfully ported to VMS, OS/2, and Win9*/NT/2000/XP (some minor functionality may be missing, though).