This rather short chapter explains fundamentals of fitting binary mixing hyperbolae to real data arrays (e.g., in 87Sr/86Sr vs. 143Nd/144Nd plots). This is done by the least-square method, and the outputs are asymptotes with curvature. The second part of the text presents reverse solution of the AFC as described by Powell (1984), using the slope of the mixing line in the 1/C vs. I diagram (e.g., 1/Sr vs. 87Sr/86Sr plot).
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