HR diagram for GENEC (red) and MESA (blue) evolution models with 60 M_⊙ (left panel) and 200 M_⊙ (right panel). Black dots represent the point where Γ_e = 0.5 and thus the wind regime transits from thin to optically thick, black crosses represent the end of the H-core burning stage, black stars represent the beginning of the He-core burning stage, cyan stars represent the switch between H-rich to H-poor helium stars, and magenta stars represent the end of the He-core burning stage.