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Fig. 1

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G0 versus (GBPGRP)0 diagram of the sample. The stars exhibiting Hα emission are reported in red. The green star symbol is the Li-rich star. The CMD is superimposed to the 12 Gyr BASTI isochrones (Pietrinferni et al. 2021) with metallicities [Fe/H] = −1.0 (solid grey line) and [Fe/H] = −2.0 (dashed grey line).

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