Iso-Zsurf lines (continuous lines) in the HR diagram at 0.8, 0.9, and 1.0 M⊙ as labeled in the figure. Also shown are the evolutionary tracks at Zinit = 0.014 (long-dashed lines) and 0.020 (short-dashed lines), from which the iso-Zsurf tracks are constructed by interpolation between equivalent models.
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