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Reprocessed Version
Rogerg,
Good spot! The dark strip at the bottom of the original image is vignetting due to the FR, anyway your comment spurred me to get around to doing FLATS and BIAS frames, I then re-calibrated and re-stacked this image set and cropped of the dark strip. Overall it made quite a difference - I did not have to push so hard, in turn this meant less noise reduction and better retention of detail. Now you can see my tracing errors and field rotation!
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