Projected rotational velocities for the O-type population in Cygnus OB2. Left: histogram representing all v sin i values for the Cygnus OB2 O-type stars (in orange), combining results from this study with those from Berlanas et al. (2020). The rotational velocities computed in this work for O stars are plotted in blue. Middle: v sin i data for O-type stars with spectroscopic masses M < 32 M_⊙ (in violet, Berlanas et al. 2020). Right: v sin i results from Holgado et al. (2022) for Galactic O-type stars with M < 32 M_⊙ (gray histogram). The cyan overlay merges the blue and violet histograms from the middle panel.