Hello,
I was wondering if anyone knows of a way to produce multilevel x-axis groupings
similar to Excel's pivotcharts. (If you're not sure what I'm talking about,
here's an example:
http://peltiertech.com/WordPress/chart-with-a-dual-category-axis/).
I realize that I could use mtext to manually insert text where desired, but I
was hoping for a more systematic approach.
Thanks in advance,
-eric
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