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On Feb 28, 2011, at 12:57 PM, Todd Mackenzie wrote: > That's better, but is there a way to make the filter circular? It's currently looks like a box and therefore doesn't go to zero in the NE, NW, SW, and SE edges. Use KAPPA MATHS via the XA and XB parameters (which contain the PIXEL coordinates) so you can calculate the distance from the centre of the array. You may need to also change the bad values in the corners to something real before you start (otherwise they will stay bad). Tim