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Jeff: Yes I too have noticed that looking at sunspots edge on they seen to be in a depression. Maybe some of the material has ejected out leaving a cooler void?
Ken:Thank you for your kind comment, I was lucky to have some very good seeing at the time. In this case the good seeing coincided with the hot weather coming over across the ditch from Australia. 30 degrees here and they call it a heat wave. LOL...
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