I've got a sat pic (from a server under "Images") on the surface, and a colour-shaded plot of theta-e at 850 hPa from the GFS above. I restrict the visible range of the theta-e to a value so only areas above a certain value are shown (to illustrate a plume event). However areas with theta-e below my range appear black, rather than showing through the sat pic below. Am I missing something simple, is this is intended behaviour, or is it a bug? Dan
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