Effects of opacities (top), overshooting (middle) and mass loss (bottom) on 20 M⊙ evolutionary tracks. The computations have been performed with the code MESA. In the upper panel, different solar heavy elements mixtures are used, for the same initial metal fraction (Z = 0.014). GN93 refers to Grevesse et al. (1993), GS98 to Grevesse & Sauval (1998) and AGS09 to Asplund et al. (2009).
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