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Off to a good start there Allan. It needs more data and the colours need to be balanced as there is a red bias plus excess blue in the background.
How are you combining the Ha? Some make a master luminance with some Ha and Luminance, red and Ha into one red and combine LRGB that way. A bit trial and error with no ability to backtrack and alter.
I personally simply add Ha as a red and a blue layer in lighten mode and adjust with curves to boost or suppress as desired. Usually that protects the RGB stars as they are usually brighter than the Ha red dots.
Greg.
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