Distribution of the (top) intermediate-to-major axes ratios versus minor-to-major axes ratios ((b/a)_DM–(c/a)_DM) and (bottom) elongation and flattening (e_DM − f_DM) of the DM component of our galaxy samples. The histograms of the x and y data are plotted on the top and right sides of each panel, respectively, with equal bin widths, showing the fraction of galaxies in each bin. The isolated galaxies are shown with filled circles and filled histograms, while the empty circles and empty histograms represent the tidally bound sub-samples. The same colour scheme as in Fig. 4 is adopted.