Panel a: hybrid CMD of all the stars in common between GEMINI and at least one of the HST epochs. Panel b: CMD of the likely field interlopers according to the PM analysis. Panel c: CMD of the likely cluster members according to the measured PMs. Panel d: VPDs of the measured stars. The circles have a radius equal to 3σ, with σ being the average PM error in each magnitude bin. The blue (red) dots within (beyond) the circles are classified as cluster members (field interlopers) and their CMD is plotted in panel c (panel b).