help: contour levels

Hi ncl-talkers,

How can I make geopotential heights below x0 with 80 gpm intervals but those over x0 with 40 gpm intervals? I use gsn_csm_contour_map_overlay to do this plot, res is for those below x0, res2, the later one, is for those over x0, but only res2 is showed in the graph.

Thanks,
Sha
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Received on Thu Jan 12 14:41:12 2012