Click here to see the SAS code.
Click here to see the example.

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Note that this example is included in the book SAS/Graph: Beyond the Basics,
and all the 'tricks' used to create it are described in great detail!

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In this example, I show one way to get multiple contour plots 
on the same graph, by using "proc greplay".

Basically, you create the 2 graphs, using the *exact* same 
title/axes/text/etc, and save them as grsegs, and then use
"proc greplay" to overlay those 2 graphs on the same page.

One small problem is that when overlaying the graphs, it makes
it look like the contour surfaces are see-through (since it
prints the axis on top of them).  So, with respect to the 
axes the surfaces look see-through, but with respect to the 
surfaces themselves, the surfaces look solid.  


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