Chemical mixing profile showing the different mixing zones in a model for an intermediate-mass star. The ordinate shows the local efficiency of chemical (diffusive) mixing. The thin outer convection zone is not shown in the plot. The radii of the convective core boundary (r_cc) and overshoot zone (r_ov) are also indicated. Mixing inside the convective regions is based on MLT and occurs instantaneously. The red dashed line slightly to the left of r_cc/R_⋆ indicates the starting point of the overshoot zone (r₀ in Eq. (1)).