Fig. 4
Comparison of the different α species and datasets. From top to bottom we show the oxygen data from Ramírez et al. (2013) (orange) and the magnesium (blue) and silicon (green) data from Adibekyan et al. (2012) and Haywood et al. (2013). The columns are for age-[α/Fe], [Fe/H]-[α/Fe] and age-[Fe/H] distributions. The [Fe/H]-age distributions are the same for silicon and magnesium, therefore we only show them once.
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