Fig. 8
Global α-enhancement: [α/Fe] vs. RGC in the open cluster observations (colour coded by age as in Fig. 6) and in the K15-improved model (continuous lines, black at the present time and blue 5 Gyr ago). For comparison, the evolution of [O/Fe] vs. RGC is shown (dashed-dotted lines, black at the present time and blue 5 Gyr ago).
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