Thanks H and Ray for explaining what the numbers on the images meant.
Does this model assume a particular method of combining? Usual practice is a simple mean or average combine. I have stared using sigma reject combine but if I understand the statistical maths involved that method really requires a substantial number of flats to be effective as it tries to identify outliers that are outside the statistical average or norm. You can't do that with 3 subs.
I sometimes find flats that are too bright are harsh and damage the lights.
Also I assume there is no bias or flat dark subtract here? I have found no flat dark and using a separate bias gets the best results.
Greg.
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