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Thank you all for your very kind feedback.
I will certainly continue working on this project, when we get a clear night.
I have also learnt that flats will certainly be needed to remove gradients near the edges around the entire image - I suspect some reflections within the CCD chamber or maybe light gets bent on the edges of the CCD itself. Luckily this pattern is consistent for all subs and I have not rotated the camera. With shorter exposures I got away with using Dynamic Background Extraction in PI...
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