Face-on view of the stellar overdensity map obtained by Poggio et al. (2021). The Sun’s position is marked with a black cross at (X, Y) = (0,0). The Galactic centre lies to the right at (X, Y) = (R_ʘ = 8.2 kpc, 0), with the Galaxy rotating clockwise. The labels indicate the positions of the Perseus arm, the Local (Orion) arm, and the Sagittarius-Carina arm, as defined by Poggio et al. (2022). The panels (from left to right) correspond to single OCs, OCs in pairs, and OCs in groups. Symbols represent the OCs in each environment.