ϵ_N vs vrot sin i. The colour scheme corresponds to the value of Γ_e. The solid pink, brown, orange, and red lines represent SMC evolutionary tracks for initial masses of 12 M_⊙, 25 M_⊙, 40 M_⊙, and 60 M_⊙, respectively, with initial rotational velocities of 110, 250, 350 km s⁻¹ (Brott et al. 2011). We multiplied by a factor of π/4 to take into account the inclination of the rotation axis (Hunter et al. 2008). The dashed black line represents the baseline ϵ_N in the SMC (Vink et al. 2023). The dots along the evolutionary tracks represent time steps of 0.1 Myr.