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

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Just a little trick to easily 'fake' overlapping histograms,
using gplot needle interpolation.  When you overlay the blue 
and yellow transparent bars, they make green.


If you *really* want to overlay true histogram bar charts, you'll 
want to use Gchart, and then Proc Greplay to overlay them. (But
that's a bit more tricky, and requires more code.)

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