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Thanks all for the comments.
Geoff - yes I saw your nice shot of IC2631. At 90sec I figure my subs are swamping read noise without oo much star saturation.
Greg - that was a big concern, colour. I had a lot of trouble with background extraction on a wide field with such a variable area. I looked at a bunch of images others have done on it and tried to imagine how it should go. Earlier versions had a lot of red around the centre of the image which I did't think should be there.
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