[α/Fe] as a function of [M/H] for a subsample of stars with S/N > 30. The full magenta line shows the thin to thick disc separation. The magenta dashed line shows the extrapolated separation for [M/H] > −0.15 dex, while the vertical long-dashed line characterizes halo stars ([M/H] < −1.25 dex). The thin disc stars are colour-coded in blue, while thick disc members are in red. The metal-rich α-rich stars are shown in green, and halo stars in black.
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