Angular velocity of the model with M_ZAMS = 6 M_⊙. Upper panel: angular velocity at the surface and in the centre of the star as a function of the age. Circles indicate the stages for which the rotation profiles are shown in the lower panel. The filled square corresponds to the end of accretion, and the triangle indicates the appearance of the convective core. Lower panel: rotation profiles during the contraction phase at different stages indicated by circles on the upper panel. The thickest line corresponds to the ZAMS.