Kinematic properties of NGC 6139, NGC 4103, LP 2219, and NGC 3114 (from top to bottom). The left panels show the spatial distribution of members in Cartesian coordinates normalized to the radius enclosing half of the members, with arrows showing the velocity vectors on the plane of the sky. The arrow lengths are proportional to the speed on the plane of the sky (velocity scale reported in the top-right corners), while their colors map the radial component (v_R) of the velocity. Positive values point outward. The right panels show the distribution of members in the v_R − R plane. The linear regressions of velocities as a function of the cluster-centric distances are shown (orange lines), as are the posterior values on the slopes (at the bottom).