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I just had a look at my Oiii data from January last year and I can see it, although I only see the arc in mine with some small zwo filter haloes around the two stars. Never noticed the arc when I processed it. I only have 2 hours of data though so it is weak, would be worth gathering some good exposure time and see if what appears to be a shell in your data starts coming away from the noise floor rather than just being filter reflection.
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