Distribution of key physical properties for the combined X-ray AGN sample from the XXL and Stripe 82X surveys. From left to right and top to bottom, the panels show the distributions of black-hole mass (log M_BH/M_⊙), Eddington ratio (log λ_Edd), X-ray luminosity (log L_X/erg s⁻¹), stellar mass (log M_★/M_⊙), SFR (logSFR/M_⊙ yr⁻¹), and sSFR (logsSFR/Gyr⁻¹). All quantities are shown in logarithmic units.