Analysis of the radial an mass distribution of the two populations. Panel a: spatial distribution of the two populations in the X − Y plane. Points are colour-coded as in panel g of Fig. 2. Panel b: fraction of MSa stars as a function of radial distance from the centre of the cluster, R. The values obtained in this work are represented with circles, while the estimates from Milone et al. (2012a, 2017) are shown with triangles and squares, respectively. Each dataset corresponds to different mass ranges (see panel c). The grey dashed lines are set at r_h and 2 r_h. Panel c: fraction of MSa stars as a function of stellar mass. Symbols have the same meaning as in panel b.