Hello David,
Nice galaxy image.
I'm not sure what caused the red band - light interference? Overall there is some good data there.
You can process this out a bit - I hope you don't mind but I had a go at it for fun (attached). The colour still isn't balanced but I git rid of most of the gradient - 5 minutes in photoshop. With more time it can be improved further. I'm not that good at processing - still a lot to learn.
Regards,
Tony.
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