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My contribution:
a) the image is very nice, with good color
b) to enhance the nebula, it seems you clip the black and white.
c) to filter noise I am using the Fitswork 4.0 option blur - wavelet noise filter that is similar to wavelet of Registax. Its performance is better than PS. Try it, it is free.
In PS I am having a good result in filter the noise channel by channel, with differrent intensity.
d) perhaps a larger number of subs can improve the ratio signal/noise.
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