Upper panel: normalised background-subtracted density map of the cluster area, in units of the background noise (σ). Contour levels are shown at 3σ, 4σ, and 5σ. The full white arrow shows the direction of the cluster proper motion, while the dashed arrow points toward the Galactic centre. Lower panel: Schlegel et al. (1998) reddening map of the same area as the upper panel. The reddening values in the greyscale bar are given in E(B − V).