Distributions of the projected rotational velocity, v sin i for the observed stars (yellow lines) and for the synthetic population (gray histograms), where the v sin i is calculated using the rotational velocities directly from the models of Brott et al. (2011). The four columns show the different quarters of the MS, as denoted above, and the four rows show the different mass bins, as denoted to the right. The numbers in the legends indicate the number of observed or simulated stars in the respective histograms (see Sect. 4.1). The simulated distribution reaches beyond the y-axis boundary in two panels, where for the 100–60 M_⊙ mass bin, the fourth quarter reaches to 0.13, and for the 60–40 M_⊙ mass bin, the fourth quarter reaches to 0.069.