Upper panel: anti-correlation between the velocity dispersion gradient inside the bulge radius rb₉₀ and the bulge Sérsic index n_b. Lower panel: correlation between the velocity dispersion gradient with the concentration index C_20,50. The Spearman’s rank correlation coefficient is ρ = −0.80 in the upper panel and ρ = 0.81 in the lower panel. Empty circles mark the bulges that are not well resolved. The error bars indicate the uncertainty of the fit of the velocity dispersion profile.