Comparison of the entropy jump Δs against the constant entropy value of the adiabatic convection zone s_bot for all grid models (filled circles; color-coding explained in the legend). Furthermore, we show also hyperbolic tangent functional fits (see Eq. (B.4) and Appendix B) between T_eff = 4000 and 6000  K (red lines; top panel) and between log g = 1.5 and 4.5 (grey lines; bottom panel).