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Fig. 3

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Behaviour of the location where Stokes V is the largest as a function of the Voigt profile parameter a and the σ-component shift υH in the Zeeman triplet. Left panel: diamonds show the maximum positions υmax numerically calculated for different values of a and very small B (υH → 0). A linear fit (solid line) is sufficient to describe the dependence of υmax on a. Right panel: dashed lines are numerical simulations of υmax(a,υH) for a = 10-3,10-2,10-1. The dotted line describes its asymptotic behaviour when the line is fully split. The bold solid line is an analytical solution given by Eq. (26) for a = 0.

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