Integrated quasar spectrum (black curve) showing the full wavelength range covered by the NIRSpec prism. The spectrum is measured within an aperture of radius 0$\stackrel{″}{.}$35 centred on the quasar emission peak and has an aperture correction of 1.119× applied. The green region shows the ±5σ uncertainty level of the spectrum, showing that S/N ≫ 5 for λ > 0.65 μm. Key quasar and galaxy emission lines are marked with dotted vertical lines and regions of strong Fe II emission, where the numerous transitions form a pseudo-continuum, are shaded.