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Fig. 4

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Top: calculated column densities (Eq. (4)) as a function of the orbital phase for the H i zone defined by the mean value of XH+ = 17 (relations (10) and (13)). Particle concentration along the line of sight (Eq. (1)) was calculated for v = 40 km s-1. Solutions giving nH = 3.9 × 1022 cm-2 at the orbital phases φ = 0.961 ± 0.018 (dotted lines) are plotted. Bottom: as in the top, but for 3 ≲ XH+ ≲ 30 and φ = 0.961.

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