Left panel: physical distance (d_ph) of the high-velocity outflow component as a function of v_max for the same sources as in Fig. 4 and belonging to the Fiore et al. (2017) sample. Large and small symbols for molecular and ionised kiloparsec-scale outflows (red crosses) and UFOs (green triangles) represent sources whose bolometric output is higher and lower than log(L_bol/erg s⁻¹) = 45.5. Solid, dot-dashed, and dashed lines report the linear relations connecting the average points of kiloparsec-scale outflows and UFOs for all sources and sources fainter and brighter than log(L_bol/erg s⁻¹) = 45.5, respectively. The position occupied by WISSH BALs and C IV broad emission line winds is reported with magenta and cyan rectangular regions, respectively (see text for details). Right panel: kinetic power as a function of bolometric luminosity for the sources reported in Fig. 4. The two lower limits represent our uncertainty on the BAL column density (see text for details).