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In those situations it may be better to stack each night separately and then stack each stack as a median stack, as each stack is already calibrated you won't need to use darks or flats again.
EDIT: That's what I do with data that has been meridian flipped, stack each separately and then flip one of the stacks and then stack the two stacks.
Last edited by billdan; 06-10-2017 at 06:52 PM.
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