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On Thu, 2007-03-22 at 16:06 -0500, Qing Xie wrote: > I'm trying to get the difference map by subtracting the native electron > density map from the complex electron density map. MAPMASK has a function > of ADD/MULT, but I don't know how to use it? > Any other ways to attack this problem in real space? use overlapmap with ADD 1 -1 presuming your maps are on the correct scale (if not you can use mapmask to scale (one of) them). Paul.