Fig. 15
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Line formation region (ζ vs. log (r/R*)) of Hα (solid blue line), He I λ4471 (solid red line), and a line from the dominating nitrogen ion (solid green line) for Sk −66◦ 171 (Teff = 29.9 kK, left panel), Sk −68◦ 140 (Teff = 24.1 kK, middle panel), and Sk − 68◦ 8 (Teff = 14.1 kK, right panel). The grey shaded region indicates the photosphere.
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