Grahame, just thought you might like some tips for this image. I imaged M83 with the RC8 earlier in the year and I think these things would help you.
Image this galaxy for 15 minutes in each colour and luminence. The colour should be 2x2 binned as you get nothing really from using 1x1. Try for 3-4 hours of data on the lum and hour or so for the colour. This will give you the data needed to work with.
Good attempt.
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