Anti-correlation between log (B/T) and C_20,50. Blue and red colours correspond to low- and high-n_b values of the associated bulge component. The upper and lower panels compare two different boundaries chosen to separate bulge Sérsic indices. The histograms on the right side show the distribution of the sample in equidistant bins in logarithmic space of B/T. The histograms on the lower side show the distribution of the concentration index.