компилировать картинки для troff или TeX (compile pictures for troff or TeX)
Описание (Description)
The GNU implementation of pic is part of the groff(1) document
formatting system. pic is a troff(1) preprocessor that compiles
descriptions of diagrammatic pictures embedded in troff or TeX
input files into the language understood by TeX or troff. It
copies the contents of each file to the standard output stream,
except that lines between .PS and either .PE or .PF are
interpreted as picture descriptions. Ending a pic picture with
.PE leaves the page position at the bottom of the picture; ending
it with .PF leaves the position at the top. Normally, pic is not
executed directly by the user, but invoked by specifying the -p
option to groff(1). If no file operands are given on the command
line, or if file is '-', the standard input stream is read.
It is the user's responsibility to provide appropriate
definitions of the PS, PE, and PF macros. When the macro package
being used does not supply such definitions (for example, old
versions of -ms), appropriate definitions can be obtained with
-mpic; these will center each picture.
