I had a comment at How do you generate math figures for academic papers? asking whether the question was a duplicate. (Carlo Beenakker is responding to it in this comment.) Since the comment is no longer there, and since I did not delete it, I assume that it was deleted in response to moderator flags. I have no objection to the deletion—the comment is largely superseded by Carlo Beenakker's—but, if it was in some way inappropriate, then I would like to know so that I can avoid further inappropriate behaviour. Is it possible to find out what happened?