Values of the quantity δ (see text) for models obtained by varying one by one the stellar parameters of the best-fit model without overshooting in Sect. 5: the mixing length parameter (top left), the initial abundance of helium (top right), the metallicity (bottom left), and the amount of overshooting (bottom right). The filled circles indicate models computed with the abundances of AGS05 and the open squares with those of GN93.
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