. F IGURE . 2. Metallicity (a), galactocentric distance (b), and distance from the galactic plane (c) are plotted against age for the related to the Galaxy globular clusters of the thick disk (triangles) and the old halo (circles). The lines gives the linear least squares bisector fits for GC of the thick disk, old halo, and whole the Galaxy. discussion in the text | previous figure | next figure .