Hertzsprung-Russell diagrams (HRDs) containing our sample of the Galaxy (left), LMC (middle), and SMC (right). Overlaid are stellar evolution tracks computed with the standard wind mass-loss rates (see Sect. 4.4 and Appendix B) and an initial rotational velocity of v_rot,ini = 100 km s⁻¹. The individual stars are color-coded based on their current spectroscopic mass, corrected for the effects of centrifugal force.