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Thanks for the information Les. I'll stand corrected. I knew about the Encke Minima and the Encke gap but wasn't sure of their relative observability - wide low contrast vs narrow high contrast. I also though the feature I saw may have been near the outside of the A ring, suggesting the Encke Gap. However if the Minima is so much more easily seen that must have been it. I assume that both times you saw the Encke Gap you could also see the minima?
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