The values of λ for Fit A in Table 2 are incorrect as published; as correctly computed from Eq. (9), they are given below:

Fit A 
εξ εη λ 
−0.8 −0.5 0.68915 
0.8 0.5 1.86369 
0.8 −0.5 1.86369 
0.9 3.43046 
0.9 −0.2 2.97818 
0.3 0.6 1.21961 
0.98 0.14 3.98539 
Fit A 
εξ εη λ 
−0.8 −0.5 0.68915 
0.8 0.5 1.86369 
0.8 −0.5 1.86369 
0.9 3.43046 
0.9 −0.2 2.97818 
0.3 0.6 1.21961 
0.98 0.14 3.98539 

Correspondingly, Figs. 7 and 9 are somewhat in error as published. The corrected relative errors in λ and Π for Fit A are smaller than those shown, but they are still larger than those shown (correctly) for Fit B.

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