Evolution of the mass of the surface convective zone (top panel) and of the surface rotation speed (middle panel) of the 1.44 M_⊙ models (C2 and C5). In model C5, the opacities are calculated from an OP opacity table assuming a fixed solar mixture of chemical elements (dashed curves), while in model C2 the opacities are calculated for the actual composition with the OPCD package. Lower panel: D_turb, rota profile for both models at 1 Gyr.