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I guess if I cycle through a few hours of LRGB - and see the deltas between the accurate L and the incorrect R, G and B I can get a sense of if there is a linear correction or if its just a random wander.
So looking at several concurrent shots taken around midnight a week ago - the readings sure don't look random...
So data from 9pm - 11pm on the 20 Jan for NGC 1566 - I would guess the variation is high cloud cover.
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