Overview of the constant entropy value of the adiabatic convection zone, which is given by the fixed entropy of the inflowing plasma at the bottom, s_bot, (circles) as well as the atmospheric entropy minimum, s_min, (squares) for two metallicities ([Fe/H] =  −0.5 and 0.0, blue and black respectively) against T_eff. The jump in entropy, Δs, is indicated with vertical dotted lines. Simulations with the same gravity are connected with functional fits for s_bot and s_min (solid and dashed lines respectively; see Appendix B), while similar simulations with different [Fe/H] are connected with short solid black lines.