Ratio f2/fM vs. the normalized velocity u for ε = 10−7 (ζ = 0), and a realistic H I Lyα illumination profile as observed by SoHO/Sumer. The peak of the line profile is located at x ∼ 5, and the central self-reversal is about 0.7 for this resonance line (see Fig. 5 of Gunár et al. 2020).
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