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Thanks Allan, Troy and Greg.
Greg, can you provide any pointers on how to get the flats right? The flats I used for this were 20x1.5 seconds. I used Nebulosity to capture and based on the pixel stats over the entire image the pixel levels range from 6780 to 14432 (mean 10892). I thought the flat should be exposed at about 30% and 60% of the maximum?
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