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Reversing a vote to close

I was recently browsing the questions and by accident (I thought I was in a different tab) voted to close a question off-topic:

Can quantum algorithms with exponential speed-up be rederived using span-programs?

In no way do I think this question is off-topic (and hopefully 4 others won't also accidentally vote), but I can't find a way to withdraw my close vote. Is there a mechanism in place to do so? I imagine accidental votes like mine don't happen often (since it requires 3 button clicks; and only the completely absent minded people like me would get confused by that), but questions do get edited for the better, potentially nullifying an early close-vote.

How can I withdraw my close vote?


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