Apparent magnitude V₀ and radial velocity v_rad of confirmed cluster GCs/UCDs as a function of R, the projected distance from NGC 3311. The histogram in the upper panel shows the number counts in radial bins of 1′ width. The dashed curves in the lower panel envelope the objects that remain after applying the rejection algorithm (see text for details). They have the form , where C_max is the product v²·R for the first object that is not rejected, and v_sys is the mean radial velocity of all objects (solid line). Open symbols denote the rejected objects. The vertical dotted line divides the inner from the outer sample.