Mean temperature structure as a function of Rosseland optical depth of the CO5BOLD model used in this work (Teff = 5850 K, log g = 4.0, [Fe/H ] = −4.0; thick [blue] line), and of the 3D model used in Caffau et al. (2011c) (5850/4.0/ − 3.0; thin [red] line). For each model, the mean temperature is obtained by averaging the temperature as over iso-τRoss surfaces of 20 selected snapshots. Shaded areas bounded by dashed lines indicate the ± 1σ range of deviations. Small open symbols outline the temperature stratification of the 1DLHD model with [Fe/H ] = −4.
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