Percentage of robust CGs in ΔV_max − μ_max space that have been observed for over 95% of the random observers, regardless of their point of view. Each box in this space represents a different CG sub-sample selected with a different ΔV_max and μ_max limits. For instance, the bottom-left box represents the sub-sample with μ ≤ 23 and ΔV ≤ 250, while the top-right rectangle displays the percentage for the full sample of CGs. Each panel also quotes the total number of CGs (in parentheses) in each resulting sub-sample. Colours are assigned in a five-level greyscale, ranging from the lowest (black) to the highest (white) percentages. The upper plot is performed with CGs with three or more members, while the bottom plot only includes CGs with four or more galaxy members.