Ionizing SEDs in νF_ν units: (1) the SED adopted by Fg97 for their LOC calculations using T_cut = 10^6.0 K (black long-dash line), (2) the optimized SED of Ri14 with T_cut = 10^5.62 K (black dotted short-dash line), (3) the double-bump distribution La with α_UV = +1.0 (cyan continuous line) as defined in Sect. 7.1, and (4) the accretion disk model derived from the OPTXAGN routine (light-green dashed line). All SEDs convert in the X-rays to a power law F_ν ∝ ν^−1.0 with an α_OX index of −1.35. The red dotted line represents a fit to the La12 UV bump at 12 eV. The magenta line corresponds to the average soft excess component observed with XMM-Newton by Pi05.