understanding curation rewards

Hi, I was looking for the info about how curation rewards work but couldn't find it again. I know that between 0 and 30 minutes you give some back to the author (100% at 0 and 0% at 30). But I don't remember how your position in the list of upvotes affects your rewards. I was wondering if the most important is the number of people who upvoted before you or the amount of SD the post has already received when you upvote.

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