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This is total bollocks. The maths is totally false. Go back to the one of the sources (e.g. [1]) and read it again, then find a way to show the correct formula here. ChR = 100 (Ta / Ts) doesn't quite get it.Emeraude 15:54, 23 October 2006 (UTC)
Just found out how to type mathematically in Wikipedia, so article redone. Emeraude 14:21, 26 October 2006 (UTC)