Fig. 7
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[Cu/Fe] versus [Fe/H] for the metal-poor giants from the Caffau et al. (2023) sample, with the GCE model from Kobayashi et al. (2020) overplotted in each panel. Left panel: line-averaged abundances in LTE and in non-LTE with Cu + H collision data from the present calculation (LCAO + Free) and from Belyaev et al. (2021) (B21). Right panel: line-by-line non-LTE abundances based on the Cu + H collision data from the LCAO + Free model.
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