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Yes the rille is the squiggly line in the images. This is an interesting feature on the Moon as it is a collapsed lava tube. We have lava tubes here on Earth located in many places, Far North Qld and Western Victoria are the best Aussie ones.
I observed the rille through a Zeiss 6" coude refractor once and that was from light polluted Brisbane. I apologise that I can't recall the Moon's phase or libration at the time.
Peter.
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