Luminosities of the X-ray, UV, and optical lines fitted with LOC models. Top: best-fitting single-component LOC model with the radial distribution power-law index γ considered as a free parameter in the fit (orange; see Sect. 3.3.4 for details). Bottom: corresponding fit residuals in units of the uncertainty σ of the line luminosity measurements. The baseline model (with the radial distribution power-law index fixed to γ = −1; see Sect. 3.3.1 and Fig. 4) and the corresponding residuals (red) are displayed for reference. The data are displayed as in Fig. 4.