Fig. 12
Median [Ca/Fe] and [Mg/Fe] as a function of metallicity, [Fe/H]. The colored lines indicate different ranges of Galactocentric distance, r. The [α/Fe] ratio increases as the metallicity decreases to [Fe/H] ~ − 2, after with the trend flattens. Note the steeper trend observed for the SDSS/SEGUE stars at [Fe/H] < − 2.5 at the largest distances.
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