Fig. 1. Three dimensional plot of fecal phosphorus as a function of diet phosphorus and fecal calcium for the 470 balances of data set 1. The diagonal plane through the data is the least squares fit according to the parameters set forth in Table 2. In the equation inset, Z = fecal P, X = fecal Ca, and Y = diet P. (Copyright Robert P. Heaney, 2002. Used with permission.).

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