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I will have to look this up and try it on the full version, I was using ccdstack flattening tool which made it worse. I also tried pix-in-sight and it created a background map which I subtracted in P.S. In the end I just dulled it down to 'hide' the problem. The issue I had was more like a flat field prob where the center was brighter than the edges in a bit of a out of shape bubble (non linear or symmetrical).
- Dave.
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