Rotation-curve asymmetry A vs. scaled cluster-centric radius r_s (left panel) and scaled rest-frame velocity v_s (right panel) for MDGs (A_morph > 0.18, red circles and dashed line) and MUGs (A_morph < 0.18, blue squares and solid line). Left panel: MDGs have the highest asymmetries at intermediate radii, where tidal interactions are more likely, while MUGs have higher asymmetries near the centre. Right panel: the asymmetry of MDGs peaks at low rest-frame velocities, while MUGs have higher asymmetries for higher values of v_s (binsize = 16).