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I am pretty poor at processing, but I had a go at stretching your jpeg data as I thought there might be scope for more data to be pulled out, and I think there is. However, vignetting stops it being stretched much more, here is a capture of the vignetting I've pulled out to over emphasise the problem. I suspect if you did some flat frames this would help reduce the vignetting and allow you (or someone else) to stretch future data a bit more. As I say, I don't thoroughly understanding imaging or processing, but that is my understanding anyway. I'll find a link to explain vignetting in a minute. Your VERY much stretched data below:

post-25543-0-65114900-1442820106.jpg

James

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