|insert() is a powerful feature allowing you to postprocess plots
by scaling, shifting, and combining them. Because inserted plots must fit
within the plot on the screen, the inserted plots must always be reduced
in size. Use of this feature is an ideal way to prepare transparencies
for talks. You can take a set of ready-made plots that contain data and
insert them into another frame that contains captions, explanations, and
analyses. This process is much faster than recreating the original plots.
See the example code in INTEST.C for an example of how to insert one plot
into another plot.