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Dark Flats are just dark frames taken with the same settings as your flat frames. For example, if your flats are 3 sec @ -10 deg C, then your dark flats need to be 3 sec @ -10 deg C as well.
This way, you don't need to explicitly take bias frames at all (and better results to boot), but all your darks/dark flats must be perfectly matched to the lights/flats.
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