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The simplest way to keep on top of flats is to take them after every imaging session. In fact I now use a light box and take flats after every target so if I have two objects imaged in a night-which happens very rarely,I'll take two sets of flats
There are so many other things that can go wrong this just reduces one more risk
It's worth making a light box too for the same reason-check the article here in IIS for a how to
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