I've not had experience with that specific type of chart, but Google makes me think it's just a scatter chart with gridlines set to somehow (via expression) only bisect each axis to create the four quadrants.
You'll obviously already have the values that drive position on the X and Y axis in your dataset.
Hope that helps.
Jon
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"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."