Mean stratification of the entropy ${\langle s\rangle }_{{\text{Np}}_{}}$ averaged over surfaces of the constant N_p and time of the G2V (left column), K0V (middle), and M2V (right) stars. Top row: mean entropy computed from the simulations run using the 18OB (black curve), 4OB (blue), and grey (red) opacity setups. Bottom row: absolute difference of ${\langle s\rangle }_{{\text{Np}}_{}}$ computed with 4OB (blue curve) and grey (red) compared to ${\langle s\rangle }_{{\text{Np}}_{}}$ obtained using 18OB.