Bulge distribution of [Mg/Fe], [Si/Fe], and [α/ Fe] with respect to [Fe/H] (upper, middle, and lower panels, respectively). The colour code shows the difference with respect to the median value (Δ[Mg/Fe], Δ[Si/Fe], and Δ[α/ Fe]) expressed in units of standard deviation. Both Δ and σ are evaluated as a function of [Fe/H].
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