Spatial distribution on the sky and relative isodensity contour map of CFHT photometric cluster members with r^Mega ≤ 21 (upper panel) and 21 < r^Mega ≤ 23 (lower panel), obtained with the 2D-DEDICA method. The BCGN(NW) is taken as the cluster center. Northern crosses indicate the location of the BCGN(NW) and BCGN(SE) of A1758N. The southern cross indicates the BCGS of A1758S. For A1758N, the two large “O” labels are centered on the two main peaks of the mass distribution (Okabe et al. 2008).