Fig. 2.
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Stellar evolution effects on surface metallicity in the PARSEC 1.2S + COLIBRI S37 stellar models. Top: Kiel diagram colour-coded by the difference between the surface metallicity and the initial metallicity. The evolution effects of diffusion and dredge-up are clearly visible. Bottom: age dependence of the surface metallicity, for two initial metallicities, colour-coded by stellar mass.
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