Outlier removal using the max(R·v²) algorithm. Left: all red GCs. In the upper panel, we plot the quantity (m_j − m_j + 1) against the index j. The number of removed GCs (j = 2) is indicated by the vertical dashed line and the arrow. In the lower sub-panel, we plot the heliocentric velocities vs. projected radius. Crosses mark GCs with velocity uncertainties Δv > 65   km   s^-1, and circles indicate GCs with Δv ≤ 65   km   s^-1. The rejected GCs are shown as dots. Right: the same algorithm applied to the Blue GCs with Δv ≤ 65   km   s^-1. Six GCs are rejected. In both lower sub-panels, the systemic velocity of NGC 4636 is indicated by a solid horizontal line. The vertical solid line at  indicates the radius inside which the photometry does not permit a separation of blue and red GCs. The dotted vertical lines show the bins used for the dispersion profiles shown in Fig. 12.