Atmospheric, dayside and nightside surface temperatures in pure radiative regime. Temperatures are plotted as functions of the logarithm of τ_s;L in the case of pure absorption (top panels), scattering in the shortwave (middle panels) and scattering in the longwave (bottom panels). Left: quasi-transparence in the shortwave (τ_s;S =10⁻⁴). Middle: small shortwave opacity (τ_s;S = 10⁻²). Large shortwave opacity (τ_s;S = 10⁰). The atmospheric temperature (solid black line), dayside surface temperature (dashed red line), nightside surface temperature (dashed blue line), and black-body equilibrium temperature (dotted grey line) are plotted using Eqs. (51)–(53) and (2), respectively. Parameters values: A_s = 0.2, and F_⋆ = 1366 W m⁻².