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Thank you for that tip RNKLN, it worked well for me.  I have been using some old low resolution jpeg photos to get familiar with AP and had stitched some handheld shots using the Panorama function.  The Pano function did surprisingly well putting the mis-aligned photos together but there were some voids in the sky.  Your tip solved that problem in just a couple of clicks.  It was a mostly clear blue Utah desert sky with a few puffy white clouds, but the result was very nice.

Wally