Δ_obs(< R_hl) (left panel) and Δ_obs(< 0.7R_hl) (right panel) as a function of the velocity dispersion ratio. Values from the simulations were recomputed according to the magnitude and spatial selections adopted for the observations (see Sect. 4.1). Simulations are color-coded according to the BH mass fraction (see the color bar). Error bars were computed from multiple LOS projections. Finally, in blue we show the values (along with error bars) obtained for Galactic GCs (see Sect. 4 for details). The observations shown in this plot are reported in Tables B.1 and B.2.