Age-metallicity relation (upper left) and dynamical ages as a function of the Galactocentric distance (upper right), total absolute magnitude (lower left), and age (lower right) for GCs of the MD, MB, HE, and LE groups. Empty small circles indicate the whole sample of GCs; larger symbols, the same as in Fig. 1, show GCs with different origins. The horizontal line is traced at N_h = 8.