The fiducial isochrones of globular clusters from An et al. (2008) are overplotted in the Hess diagrams of absolute magnitude. The upper panel shows the thick disc simulated by TRILEGAL using parameter set 2. The fiducial isochrone of the globular clusters M 71 is overplotted as a white line. The lower panel shows the corresponding halo populations. From left to right, white lines represent the fiducial isochrones of the three globular clusters M 71, M 13, and M 92 (Table 1) covering the halo’s metallicity range. (A colour version is available on-line.)