Upper panel: cumulative radial distribution of SG (red) and FG (blue) stars selected as detailed in Section 3. Lower panel: NSG/NFG as a function of the distance from the cluster center. For the high-resolution sample proper-motion selected stars have been counted, while for the wide-field sample a statistical decontamination from Galactic field objects has been adopted. A flat distribution around NSG/NFG ~ 1.2 is observed.