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Old 22-05-2016, 11:57 PM
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Atmos (Colin)
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Join Date: Aug 2011
Location: Melbourne
Posts: 7,013
Quite an interesting region in Ha, thanks Greg

Quick question, around some of the brighter stars, is it a diffraction ring or processing artefact?
They look like diffraction rings but I don't think I've ever seen them in a Ha image before
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