Spatial distribution in Cartesian coordinates (x, y) of the studied cluster. The size of the points is proportional to the astrometric membership probability. The different populations are colour coded as in Fig. 1, excluding the binaries and BSSs for clarity. The dark grey arrows in the bottom left corner show the direction of motion and their length is proportional to the velocity in each axis. The light grey arrows in the top right corner show the direction to the Galactic centre.