Thanks to David Winsemius, Peter Ehlers, and Paul Murrell who pointed
out my careless error working with ggplot2's geom_rect(). Not to make
excuses, but when you've done something successfully dozens of times and
suddenly it doesn't work, you're more likely to look for careless errors
on your part. When you've never done something before and unsure that
you understand the proper use of the tool, you're more likely to think
you're missing something about the tool's proper use and to overlook
your own careless errors.
This list is great! I posted my question, went off to do something else,
and within a few hours had the answer to my problem.
Thanks again
Marsh Feldman
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