α-enhancement [α/Fe] over metallicity [Fe/H] for all metallicities (upper left panel). The blue bars indicate the metallicity bins, which are used to select stars to estimate the α-enhancement distribution in corresponding blue at different metallicities in the other panels, with mean [Fe/H] indicated in the upper left or right corner. Two Gaussian distributions are fitted to the data with mean values indicated by the red lines and their distribution in black. Mean and standard deviation of the two Gaussians are annotated in each panel. See Sect. 4.2 for detailed discussion.
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