Comparison of Rosseland mean extinction coefficients. Left panel: Relative differences between Rosseland mean extinction coefficients from Blue and those previously adopted in the Stagger code (Hayek et al. 2010; Trampedach et al. 2014), computed via (α_{Ross, BLUE} – α_{Ross, T14})/α_{Ross, T14}. Blue extinction coefficients are calculated with the internal EOS in Blue (FreeEOS) when log T ≤ 3.9 (log T ≥ 4.1). Results from the two different EOSs are merged in the region where 3.9 < log T < 4.1 (cf. Sect. 2.2.2). The (ρ, T) distribution of the horizontal- and time-averaged reference solar model atmosphere is over-plotted as a thick black line. The grey dotted vertical line crudely marks the temperature limit above which the radiative transfer equation is not solved in the reference solar simulation. Densities and temperatures are in cgs units. Right panel: Relative differences between Rosseland mean extinction coefficients from Blue and those of Ferguson et al. (2005) for the AGSS09 solar composition. The white areas are (ρ, T) combinations not covered by the Ferguson et al. (2005) opacity table.