Convergence of the surface velocities towards MS equilibrium. Both panels show the evolution of the ratio v_surf/v_crit during the early MS as a function of the central mass-fraction of hydrogen that depicts time along the MS. The upper panel shows the case M_ZAMS = 9 M_⊙ and the lower panel the case M_ZAMS = 60 M_⊙. On each panel, the blue dashed curve corresponds to the model built by accretion, described in Sect. 4.2, while the grey solid curve indicates a model started on the ZAMS with a flat rotation profile with the same mass and angular momentum as the blue model. The grey dotted horizontal lines indicate the critical limit.