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Every 4x captures gives you half the noise, so there are diminishing returns after 40-50 captures and the amount of noise reduction is very minimal.
If you've captured much more, you could go through each individual shot and zoom in 100-200% and pick the very best of your data and narrow it down to 40 and stack with them.
I like to use two stars very close to each other if possible, almost touching, and use the tiny gap to judge the quality of a shot.
Best of luck, you've brought out quite a bit of colour, I like it!
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