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Fig. B.1

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Decimal logarithm of the hypergeometric function 2F1 (u) (black line) appearing in Eq. (6), and total number of terms in the Taylor series required to reach the computer precision, i.e. 16 digits (right axis). This number can be reduced by a factor two for a 8-digit precision; see Sec. B. The parameter is γ ≈ 1.89 corresponding to iron (see Table 1).

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