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Fig. 19.

image

Panels a and b: same as Fig. 5 for the parallel model results. The dashed black line depicts the low-α model phase, whereas the black solid line stands for the high-α phase. In the latter case, the thin line shows the period of the evolution when the number of stars born in age bins of 1 Gyr is smaller than 2% of total number of stars formed. Panels c and d: chemical evolution model results where we have taken into account estimated age and [M/H] errors. Analogously to the thin solid line in the upper two panels, smaller purple starred symbols are associated to stars with ages lower than 8 Gyr (before the inclusion of age errors). Details are given in the text.

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