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You are correct, aliasing but not folding so far, and so that is another issue to worry about... Wayne On Mon, 3 Mar 2008, Brian Smith wrote: > Wayne, > > > get the spectrum value there. Only for points between 256.5 and 257 (but > > < 257) the nearest position is 257, which is outside the grid, so the code > > was getting an error because it was not correcting for this. It is now > > wrapping around to point 1 instead. > > Are you taking notice of whether the folding is "aliasing" or "folding" > yet? I know the data model has support for both, but last time I looked > analysis only handled "aliasing" (which is indeed what most people do). > Might that impact on the point sums? > > Brian >