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John, you might be right about the overcast sky. I used one that was as even as my eyes could tell, and felt that since the FOV would be relatively small I should get away with it. When I did use the overcast sky flats, as flats they did work well, it is just that I had to change the colour scaling values to regain G2V balance. The light frames were however flattened effectively.
cheers,
Doug
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