This driver is only known to work the Free Software Foundation
 gpic/groff package.  Modification for the Document Workbench
 pic/troff package would be appreciated.  FSF gpic can also
 produce TeX output.

 A simple graph can be formatted using

      groff -p -mpic -Tps file.pic > file.ps.

 The output from pic can be pipe-lined into eqn, so it is possible to put
 complex functions in a graph with the set label and set {x/y}label commands.
 For instance,

    set ylab '
 Will label the y-axis with a nice integral if formatted with the
 command:

    gpic filename.pic | geqn -d         > filename.ps

 Figures made this way can be scaled to fit into a document. The pic
 language is easy to understand, so the graphs can be edited by hand if
 need be. All coordinates in the pic-file produced by gnuplot are given
 as x+gnuplotx and y+gnuploty. By default x and y are given the value 0
 If this line is removed with an editor in a number of files one can
 put several graphs i one figure like this (default size is 5.0x3.0 inches)

    .PS 8.0
    x=0;y=3
    copy "figa.pic"
    x=5;y=3
    copy "figb.pic"
    x=0;y=0
    copy "figc.pic"
    x=5;y=0
    copy "figd.pic"
    .PE

 This will produce an 8 inches wide figure with four graphs in two rows
 on top of each other

 One can also achieve the same thing by the command

   set term pic x y

 For example, using

   .PS 6.0
   copy "trig.pic"
   .PE