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maybe have a look at your master flat which may have a dust mote in about this location - one that wasn't there when the lights were taken. Flat fielding will then give you a region with extra gain and that region will move in a path if you have any differential flex in your guiding system. The net effect would be an irregular brighter line feature like this. A spec of some type of fibre on your flat could give the same result.
just a guess.
in any case, it is a nice image.
Last edited by Shiraz; 25-01-2016 at 03:39 PM.
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