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Fig. 10
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Na i abundances in 1D LTE, 1D NLTE, 3D LTE, and 3D NLTE for our selected benchmark stars and the ultra metal-poor star SDSS J102915.14+172927.9. The derived A(Na) represents the weighted mean and the one sigma standard deviation of the available lines measured as in Lind et al. (2022).
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