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Thanks guys, that was exactly my thinking. And thanks for the tip to do steps 2 & 3 for multiple nights as well, I didn't think of that.
Suavi, you said that you do calibration on images from multiple nights. Do you have a fixed setup (observatory)?
I have to remove scope/camera from night-to-night (portable setup in the backyard with kids) and the flats will change from night-to-night. Hence step 1 has to be done separately for each night.
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