Normalised temperature as function of logarithm of parameter L_sen for various values of L_adv. The parameter L_adv, which controls advective heat transport by the stellar and anti-stellar circulation, varies in the range (from dark blue to green). The atmosphere is quasi-transparent in the shortwave (τ_s;S =10⁻⁴), pure absorption is assumed (β_L0 = β_S0 = 1), A_s = 0.2, and F_⋆ = 1366 W m⁻², similarly as in Fig. 6. Here, the atmosphere is optically thin in the longwave: τ_s;L = 0.1, which corresponds to the middle panels of Fig. 6.