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Looks like 2 things to me:
1. A bit of tilt, its worse in the top right corner.
2. It looks like an image you get when its windy and the autoguider gets pushed off or has a patch of large errors then settles back down.
Do you get these stars every time or is this a one off?
RS200 is sensitive to collimation. I had one once.
Greg.
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