Results of the SED fitting of the HYPERION QSOs using the lum-K13 (blue) and S23 (red) templates. The dotted blue and dashed red lines give the unextincted SEDs, which have been extended below the Lyα with a double power law as explained in Sect. 3.3; L_bol is the integral under the dotted/dashed lines. Data at UV wavelengths shorter than Lyα were not considered in the fitting and are colored gray. The cyan stars indicate measured 1 keV luminosities; see Table 3. The subpanels show the residuals with respect to the K13 best-fit SED. The black circles refer to the residuals computed using only the uncertainties on the photometric points, while the red crosses represent residuals for which also the scatter on the SED template was taken into account.