Flux-calibrated and normalised spectra of the first nine sources in Table A.1. Each panel contains the spectrum and in some cases also a continuum and galaxy model for each source. Each panel has two parts. Upper: flux-calibrated and telluric-corrected spectrum (black) alongside the best fit model (red). The flux is in units of 10⁻¹⁶ erg cm⁻² s⁻¹Å⁻¹. The elliptical galaxy component is shown in green. We note that the plots are in observer frame and in logarithmic units, therefore different parts of the galaxy template are visible in each plot. The fits to intervening absorption systems are shown in magenta. Lower: normalised spectrum with labels for the detected spectral features. Atmospheric telluric absorption features are indicated by the symbol ⊕ and Galactic absorption features are labelled ‘MW’ and ‘DIB’.