Broad-band mean quasar SED introduced in Shen et al. (2020) which we assign to unobscured AGN in this work, normalised at 1 μm. This SED is a combination of multiple templates from the literature: IR template of Richards et al. (2006b, red), optical/UV SED template of Krawczyk et al. (2013, blue), EUV power-law model based on the spectral index of Lusso et al. (2015, orange), which is directly connected (magenta) to the X-ray template of Hopkins et al. (2007, green). The template in this figure is a rest-frame realization of the SED with no IGM absorption, generated with the mean α_ox of Lusso et al. (2010), ⟨α_ox⟩= − 1.37. The blue shaded region indicates the range in possible realisations of the optical portion of the SED considering α_ox values with the reported dispersion of 0.18.