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Nice Robert!
Yes, I'm leaning towards John K's explaination of its the seeing, not underexposure that causes the onion rings. It kind of makes sense: In less than good seeing you can see the planet going in & out of focus, as well as the planet changing it's overall diametre when you study the AVI. If you stack different planetary diametre's you end up with onion rings. Does that make sense?
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