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this article needs an example graph to illustrate the meaning of the words. IMHO 79.66.218.118 (talk) 19:52, 19 April 2012 (UTC)[reply]
This page references a Figure 2 but there is no Figure 2 shown. — Preceding unsigned comment added by Editor1023 (talk • contribs) 20:04, 19 November 2019 (UTC)[reply]