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Fig. 9
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Left : EW ratios of two Ca II lines (8542 Å and 8662 Å) as a function of S/N. The two horizontal blue lines are limits of EW2/EW3 at 0.2<EW2∕EW3<2.2, defined as reasonable values by Tolstoy et al. (2023). Right : comparison between spectra of the metal-rich star 5 in Tucana IV and the metal-poor star 26 in Grus II.
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