Mass distribution of the giant stars assuming different age limits (3, 4, and 6 Gyr from bottom to top). Red histograms correspond to y-exαFe (i.e., younger than the age cut) giants of the main and additional samples (full and dotted respectively). The blue and black histograms correspond respectively to the young [α/Fe]-normal giants and to exαFe giants older than the cut (for these two cases we show only the distributions of the main sample stars). All the histograms are scaled to have the same height for the purpose of visibility, and the numbers on the left give the number of stars in each color-coded class of giants.