Fig. 3
Panel a) The occupation probability function Wn (in logarithmic units) for the bound states of H I with the principal quantum number n for a typical physical parameters at τR ≈ 0.2 of a model of Teff = 25 000 K and lgg = 4.0. Explanation of the functions displayed is given in the text. Panel b) The same as panel a), but for He II.
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