Fig. 7.
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Elemental abundance ratios versus atomic number, Z, for stars in the sample with −3.1 < [Fe/H] < −2.4. Coloured symbols indicate abundance patterns for stars CES1543+0201 (magenta) and CES2254-4209 (cyan) with errors. Black symbols indicate the average abundance ratios of Zn-normal stars. Black error bars represent the standard deviation around the mean abundance. Abundance ratios of neutral and ionised species are scaled to their Fe counterpart.
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