Metallicity distribution in the four different radial regions distinguishing between young (1−2 Gyr, upper panel) and old stars (8−9 Gyr, bottom panel) for Selene (left, current locations; middle, birth locations; right, current location not considering accreted stars). Blue, green, red, and black histograms represent particles in regions 1, 2, 3, and 4 respectively. The distributions are different for the young stars compared to the similar distributions in the case of the old component.