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Well that's true but in general most people take their light frames then when finished their darks.
I found it gets quite a bit cooler in the wee morning hours, a 5degree C drop is common. Thus very easy for darks to be at a different temp.
I took a series of darks on different nights, to make a "dark library" but found matching these to light frames impossible unless I inspected the temp on every exif.
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