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Fig. 2.


HR diagrams for initial [Fe/H]ini = −0.35 (top panel), [Fe/H]ini = 0.035 (middle panel), and [Fe/H]ini = +0.25 (lower panel). The dashed curves represent models without grad and the solid curves represent models including grad. Black symbols are stars from the Kepler Legacy sample (Lund et al. 2017; Silva Aguirre et al. 2017).

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