use plotutils to generate line and scatter plots in idraw format PostScript

plotutils is put out by the GNU project, available through http://www.gnu.org/software/plotutils/plotutils.html. local-copy

"graph -T ps" can be used to generate output in idraw-compatible postcript, which can be imported into any ivtools drawing editor, via the import dialog box or use of the "telcat" mode on comterp.

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