Fig. 7

Bottom panel: difference between [Fe/H] values adopted by T17 ([Fe/H]_T17) and [Fe/H] as listed in the DR13 catalogue ([Fe/H]_D13), as a functionof [Fe/H]_T17. Middle panel: same as bottom panel, but for [α∕Fe], considering the total α-enhancement from DR13 data (see text for details). Top panel: same as middle panel, but in this case the DR13 estimate is actually [(Mg + Si)/Fe] (see text for details).
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