Fig. 2.
Same as Fig. 1, but for the fourth-order non-orthogonal fit. The best-fit values of ai are different from those of the fifth-order non-orthogonal fit shown in Fig. 1, which is a consequence of the correlation between the parameters. These values are also inconsistent with those of the fifth-order orthogonal fit, except for a4 (as already explained for a5; see Fig. 1).
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