Note. The power law is given as f₁₀₀₀ ∼ λ^−α, with flux density units 10⁻¹⁶ erg cm⁻² s⁻¹ Å⁻¹. For the emission-line components, we list the integrated flux (in 10⁻¹⁶ erg cm⁻² s⁻¹), the centroid (in Å) and the full-width at half-maximum (in km s⁻¹) of the combined line profile. For the Fe ii template, the flux listed is relative to the strength of the I Zw 1 Fe ii emission. When no values are reported for a given component, that component was not used in the fit. When no errors are reported for a given component, that component reached a limit and became fixed in the fit. We report the redshift as determined by the centroid of the total Hα line. In the case of Q 1031+3953, where the Hα is not covered, we use the [O iii] λ5007 line. All wavelengths are reported relative to our optically based redshift. The optically based redshift is also employed in the construction of the composite.

^aThe [O iii] doublet was fitted with two Gaussian components. The λ4959 component has the listed flux and FWHM with a centroid of 0.990 4272 times the λ5007 centroid.