Fig. 4
Spectral ranges of the He I IR line in models A2 (upper panel) and B6 (lower panel) in the original configuration (red lines) and when the radiation field below 504 Å (blue lines) is omitted. The dashed black line shows the underlying photosphere alone (from Husser et al. 2013 with Teff = 3500 K, log g =5.0 dex, [Fe ∕H ] = 0.0 dex, and [α∕Fe] = 0.0 dex).
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