Ratio of AGN and galaxy luminosity for CW candidates. The left panels show the ratios in B, V, and K; the top and middle right panels the ratio in X-rays at [2-10] keV, and in radio at 2 GHz; the horizontal lines mark L_AGN/L_gal = 1. The bottom-right panel shows the bolometric luminosity; the horizontal line marks L_bol = 10⁴⁵ erg s⁻¹. For MBHs with f_Edd < 10⁻³ we show an upper limit to the brightness ignoring the correction to radiative efficiency (filled dots) and a lower limit including the correction (empty dots).