2D-DEDICA contours (black) as obtained by the analysis of the substructures within 2 R₂₀₀ for the FGs in our sample. Black points are galaxies; red squares represent spectroscopically-confirmed members; and, in particular, large open squares indicate the position of the BGGs. The black crosses are the centers of the significant peaks identified by 2D-DEDICA within R₂₀₀, which position is reported in Table 3. Superimposed, blue circles are the peaks at 99.9% c.l. and cyan circles are the peaks at 99% c.l. as detected from the Voronoi procedure. The black circles are the R₂₀₀ radius. The gray dotted lines represent the PA of each system, as reported in Table 4.