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The bias also improves the quality of the flat (not sure how?), probably by removing readout and electronic noise. Usually if bias are used, dark flats are not.
I always take darks, bias and flats new with each imaging session, as temperature matching of the darks to the lights is also very important. With a library, the temperature at which the darks were taken might not match with the lights. My qhy8 does not need darks though.
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