компилировать картинки для troff или TeX (compile pictures for troff or TeX)
Ошибки (баги) (Bugs)
Characters that are invalid as input to GNU troff (see the groff
Texinfo manual or groff_char(7) for a list) are rejected even in
TeX mode.
The interpretation of fillval is incompatible with the pic in
Tenth Edition Research Unix, which interprets 0 as black and 1 as
white.
