Distribution of the mean equatorial velocity during the MS for the EMP source star models. The three fits are the same as in Fig. 10, but adapted to the new x-axis (see text for details). The dashed black distributions show two equatorial velocity distributions reported in Huang & Gies (2006, H+2006) and Ramírez-Agudelo et al. (2013, Ra+2013), based on the observation of Galactic and LMC O-type and B-type stars (see text for details). The segments at the top show the υ_eq range during the MS for the vv6 model (grey) and for a 20 M_⊙ model computed at solar metallicity with υ_ini/υ_crit = 0.3 (black).