[El/Fe] ratio as a function of [Fe/H] for Group 1 stars (filled circles) investigated here and for comparison thin-disc stars analysed in this work, Paper I, and Paper III (open circles). The data for the Milky Way thin-disc dwarfs taken from other studies are shown as a grey dots. Solid lines are Galactic thin-disc chemical evolution models presented by Pagel & Tautvaišienė (1995). Average uncertainties are shown in the box for Na.
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