Upper panel: values of vs. T_eff for our OB sample, with . Overplotted are the evolutionary tracks from Brott et al. (2011) for v_init ≈ 300 km s^-1and seven values of . The size of the data points is proportional to the values of vsini. Stars close to the ZAMS with anomalously low vsini are highlighted in blue. Lower panel: projected rotational velocities vs. initial evolutionary masses. O stars are colored in blue, and B-supergiants in red. Horizontal lines represent upper and lower limits to vsini as deduced from Fig. 1 in Wolff et al. (2006) (dashed) and Fig. 5 of Penny (1996) (solid), additionally corrected for by a constant value of −19 km s^-1 to account for extra broadening.