Fig. 5.

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Evolutionary tracks of the 60 M⊙ models at solar metallicity, showing the surface hydrogen mass fraction as a function of current total mass (hydrogen depletion curve). The horizontal line indicates the threshold of surface hydrogen below which a hot star becomes classified as a WR in our models. The “/” markers on the tracks separate the curves into the four characteristic sections (I)–(IV), as explained in the main text.
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