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Aug 12, 2011 at 9:51 vote accept Max Gordon
Aug 11, 2011 at 18:58 comment added chl +1, a more complete illustration than mine. (In fact, I knew there was something in the TeachingDemos package but was too lazy to search for it.)
Aug 11, 2011 at 15:23 history answered Greg Snow CC BY-SA 3.0