Comparison of the spectral energy distribution of all 23 quasars. Upper panel: Absolute luminosity. Middle panel: Luminosity of the 19 RQQs normalized to unity at log ν = 14.25 (the longest wavelength available for all objects). Note that PG 1626+554 is the only quasar for which a steep α_x is associated with a strong soft excess; in all other objects a steep α_x is associated with a low 2 keV flux. Note also the two lowest spectra (PG 1001+054 and PG 1411+442), which appear to form a distinct group of "X‐ray–weak" quasars. Lower panel: As in middle panel, for the four RLQs. PG 1425+267 may also be an "X‐ray–weak" quasar.