In the upper panel, the abundance of Mg (filled hexagons) and Ca (square) versus [Fe/H]. To derive [Ca/Fe], the lines of Ca ii have been taken into account. The 3D corrections are applied. In middle and lower panel, the 1D-LTE abundances ration [Ca/Fe] and [Mg/Fe], respectively, with the same symbols, are compared to the “First Stars” results (Bonifacio et al. 2009).
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