[El/Fe] ratio as a function of [Fe/H] in the Group 1 stars (green dots) investigated here, Group 2 (blue triangles, Paper III), Group 3 (red squares, Papers I and II), and comparison thick-disc stars (purple diamonds). The literature data for the Milky Way thick-disc stars are shown as a grey dots. The averaged values for α-elements consist of Mg, Si, and Ca abundances.
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