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OK. I manged to make sense of Jupiter2 and all is well.
So the black "spot" was Calisto. I guess it shows up as black against Jupiter.
As for the dark smudge, I thought it may have been the GRS but it was on the Eastern side. Jupiter2 says it should have been on the western. So I don't know what I saw. It was just below the lower major band, I think.
Thanks again for your help.
Shane
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