Integrated spectra for the AGN+host (lenticular galaxy) at redshifts 0.76 (left), 1.50 (centre), and 2.30 (right) obtained by adding the signal from the spaxels within the host’s effective radius (see Sect. 4.2). The labels in the top right corner indicate the host and AGN (AGN42 → 10⁴² and AGN43 → 10⁴³ erg s⁻¹) luminosities. The numbers in the top left corners indicate the S/N in the rest-frame 5050−5250 Å obtained using the der_snr algorithm. The blue-dotted lines correspond to the QSFIT model to each spectrum. Red lines draw the Gaussian profiles fitting the broad (dotted line) and narrow (dashed line) components of the emission lines in the AGN spectra.