HR diagrams for a subsample of stellar models. Left panel: Non-rotating models. Coloured lines correspond to models with initial masses of 10, 15, 20, and 25 M_⊙, and the remaining models are shown as faint grey lines. Right panel: Evolutionary tracks for stars with initial masses of 10, 15, 20, and 25 M_⊙ and different initial rotational velocities, as indicated in the panel label. We note that the model with an initial mass of 25 M_⊙ and an initial rotational velocity of 400 km s⁻¹ lies outside the parameter space of the current study (see Table 2).