Excellent! I made a final stack and the results remain rather similar, it’s clear I need to take way longer subs I think with H-alpha (as shown by @chrisvdberge on his site). What I do notice in my data is the regular background pattern in the final stack, do you notice that? Diagonal from top left to bottom right, it’s in my data but I wonder what that would be.
Thanks again for the great step-by-step guide, it really helps.