Fig. 7.
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Evolution of surface mass fraction ratio of carbon to nitrogen as a function of evolutionary ages. Left panels: for the 10 M⊙ stars with Z = 0.014 but with different initial rotational velocities, vini = 0 km s−1, 120 km s−1, 250 km s−1, and 350 km s−1. Right panels: for the 10 M⊙ stars with Z = 0.0008 but with different initial rotational velocities.
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