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Fig. 8
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Normalised atomic velocities variations of f3 velocity distribution of the second excited level of a three-bound-level hydrogen atom. Results (coloured lines) were obtained for different optical depths: τ31 = 0.5, 1, 10, 102, 108, 5 · 108, 1012. The dashed black line shows the Maxwellian limit f3(u) = fM(u).
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