Fig. 11.

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Models C and C* with a mass 15 M⊙ with Vini/Vcrit = 0.4. Left panel: evolutionary tracks in the Hertzsprung-Russell diagram during the MS phase. Middle panel: change in the nitrogen to hydrogen ratio normalized to the initial value vs. the surface gravity. Right panel: variation in the effective temperature as a function of the central helium mass fraction.
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