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Very nice image Malcolm! i did notice that there are some black specs in the background. i have found these when my calibration images were not taken at the same temperature. i.e. your flats should have been dark subtracted with a dark frame of the same exposure length and temperature. i am not sure if it makes a difference if your flat frames are short subs but i would have it at the same sensor temp too. This was my finding from using CCD stack, i am not sure how DSS handles it.
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