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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