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Fig. 1.
Evolution of Xcore as a function of time for models of 5 M⊙, Z = 0.02 (GN composition, Grevesse & Noels 1993) computed with ESTER using the simple scheme for hydrogen burning (Eq. (5)) and with the Geneva code (Ekström, priv. comm.). These are non-rotating models computed with no mass loss and no overshooting.
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