Histograms of the temperature (left) and density (right panel) distributions taken at ⟨log τ_Ross⟩ = −4.0. We show the histograms averaged on constant geometrical height (top), column mass density (middle), and Rosseland optical depth (bottom). The surface gravity of displayed models is log   g = 4.5 and the metallicity is solar (dashed lines) and subsolar with [Fe / H] = −3.0 (solid lines). The mean values are indicated by filled and open circles for [Fe / H] = −3.0 and 0.0, respectively.