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Hi Paula,
IMHO, it looks like the rework actually has more noise than the original, possibly as a result of the dark subtraction. Colours in the nebula itself are better but there's a green tinge in the dark areas,
What did you use for dark subtraction? Did you dither?
I'm not sure about APT, but Backyard eos can dither between frames using phd (enable the server in phd) and that makes a big difference in reducing noise.
Cheers
Edit: you've tamed the core very well in the rework. I'd suggest adjusting the green a bit in just the shadows using levels or curves.
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