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Thanks for the comments everyone.
I was also surprised by the plume, and went off to search for it in other images and indeed found Jays which shows it very well.
Andrew - for the tricolour image, I used the SHO palette where SII is mapped to red, Ha mapped to Green and OIII mapped to blue.
M1 is one of those objects that has plenty of emission across spectrum; I have some RGB data too and it is very strong.
cheers
Martin
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