Thermal structures of the simulations in Table 1 as a function of the optical depth at λ = 5000 Å. Darker areas indicate temperature values with higher probability. The solid light blue curve is the average temperature, the red dashed line is the 1D MARCS model profile with surface gravity g (Table 2) and the green dotted-dashed line is the 1D MARCS model with surface gravity g_eff (see text). In the top right panel the 3D mean thermal profile is compared to a cool MARCS model at 3430 K for the outer layers and a hot one with 3700 K (magenta dotted-triple dashed line) for the continuum-forming region (see text).