A charting preprocessor for the groff (GNU Troff) document formatting system. See also
picandgroff. More information: https://manned.org/grap.
grap file and save the output file for future processing with pic and groff:grap {{path/to/input.grap}} > {{path/to/output.pic}}
grap file to PDF using the [me] macro package, saving the output to a file:grap {{path/to/input.grap}} | pic -T {{pdf}} | groff -{{me}} -T {{pdf}} > {{path/to/output.pdf}}