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for a OSC (colour) camera it would be as many subs as you can get.
I wouldn't bother with any other filter except for Ha (maybe), but im not sure how much Ha M31 has. i would recommend spending way more time on the "rgb" capture than Ha.
the best way to process OSC data is to extract the luminance and blend it back in a LRGB manner (your options don't consider Luminance which is the way more important than 'colour' - as the colour data can be terrible and it it will still produce a good image if the luminance is good).
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