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Fig. 6
Left panel: same as Figs. 4 and 5 but for the NaD range. Right panel: NaD range in the synthetic spectra of P1 with [Na/M] varying from −0.25 to +1.00 bystep of 0.25 dex. The residuals at the bottom are plotted with respect to the spectrum having [Na/M] = 0.00, as assumed for the primordial population.
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