Evolution of a 40 M_⊙ model with an initial rotation rate of 100 km s⁻¹ and a factor of unity for the mass-loss prescription shown for a variety of overshooting α_ov = 0.1, 0.3, 0.5. The blue dots correspond to TAMS for each model, demonstrating the increase in luminosity or decrease in mass for an increase in overshooting of α_ov = 0.1 − 0.5. This illustrates the possible further extension of a vector in this plane by extending α_ov.