Profile of specific entropy as a function of the depth in the model. The origin of the depth is taken as the location of then entropy minimum in the superadiabatic region. Average specific entropy profile of a 3D simulation is represented as a solid black line, and the entropy of the adiabat as a dash black line. The entropy of the adiabat is an input of the 3D model. Other curves are profiles of specific entropy obtained with 1D models computed with different values of α_MLT = 1.5 (blue), 1.75 (orange), 1.82 (green), and 1.9 (red).