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Approximation of logarithm ln(y + γ) in Eq. B1 by quadratic polynomial A lny2 + B lny + C. Solid lines show the original functions and the dotted lines indicate their approximations. In all fits, the coefficient A = 0.07 and the coefficients B were obtained from the empirical function f = 1.8 ln(Kn/k) − 4.2 (multiplied in plot by 10 to fit the scale).
