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The best compromise seems to be min/max excluded average assuming you have a decent number of light subs....there are some reasons to use other methods for the combination of darks when median will deal with warm pixels best and flats where I think best choice is average.
I am also beginning to multiple stacking techniques and then use layers to allow independant developement of faint and bright regions in a frame while preserving star colours...but I have finished experimenting with this yet.
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