[O/Fe] vs. age distribution for all disc stars included in Fig. 2 (5 <r< 10 kpc and | z | < 3 kpc), for the galaxy MaGICC-g15784. The densest (i.e., most populated) regions are shown in red and the least dense in black. Blue horizontal dashed lines indicate the high-α cuts that are used in Fig. 4 to investigate the radial gradients of chemically selected populations, as opposed to spatially selected populations exposed in Fig. 2. We have two main peaks, with different age and [O/Fe], i.e. young α-poor and old α-rich stars. We call “thick disc” to those disc stars with [O/Fe] > −0.05 dex and “thin disc” to those with [O/Fe] < −0.05 dex.
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