Flux-calibrated and normalized spectra of the first eight sources in Table 1. Each panel contains the spectrum, continuum, and galaxy model for a given 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⁻¹ Å⁻¹. The elliptical galaxy component is shown in green. Lower: normalised spectrum with labels for the detected absorption features. Atmospheric telluric absorption features are indicated by the symbol ⊕ and Galactic absorption features are labelled ‘MW’.