Rest-frame SED of PSO J191+86 from radio to X-ray frequencies. In the X-ray, we show the best-fit emission in the observed [0.5–10] keV energy band (green dotted line) with its uncertainty. We also report the TNG and LUCI spectra (in black) and a quasar template (SWIRE template library; light-green) as a guide line. The red dashed line represents the coronal emission expected from a RQ AGN with the same L_2500 Å as PSO J191+86 according to the relation of Just et al. (2007), and the orange shaded area is the 1σ uncertainty on this estimate.