Top panel: histogram of the projected rotational velocities of the new variability class candidates in NGC 3766, divided into candidates with their dominant photometric period P₁ > 0.55 d (135° and vertical shaded blue) and P₁ < 0.55 d (45° shaded green). Confirmed binaries are vertically shaded. Bottom panel: same as top panel, except for the SPB candidates (45° shaded red) and the hybrid star (135° shaded magenta).