Distribution of the relative errors (from left to right): radial velocity (eRV), proper motions in right ascension (ePMRA), and declination (ePMDEC), and in heliocentric distance eD_⊙. Blue histograms represent the error distributions. The following GCs are not shown because the error values are too high: Crater, Lae 3, NGC 6760, BH 261, NGC 6553, and Pal 13, except in the graph in the bottom right panel.