Spectral energy distributions obtained for slim accretion discs for a representative black hole mass, M_BH = 10⁷ M_⊙ for two cases of accretion rates (dimensionless): Left: = 100, right: = 500. In both panels, SEDs are shown for two cases of orientation, one representative for the distant observer, i.e. θ = 10° (shown in orange) and the other representative for the BLR, i.e. 80° (shown in blue), where θ is the angle between the line of sight and the black hole symmetry axis. The locations for the 1 Rydberg and 0.1 keV are highlighted in each panel with the black dashed and dotted lines, respectively. These models are taken from Wang et al. (2014) and are applicable for I Zw 1-like sources, where in particular the for I Zw 1 estimated by Huang et al. (2019) is 203.9.