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There is something "odd" about how the site is handling this question. It shows "NO" answers, even though it has two. Also, the two tags "tachyon" and "plot3d" don't show up in the list of tags on the site. I think, maybe, this happened because I accidentally posted the question twice, and so one of duplicate posts had to be deleted? In any event, I just wanted to note it. Hopefully it is only this one question, and not a generic problem.