Residual spectra for our 5 quasars from the quasar-subtracted datacubes, extracted within the rc = 1.25′′ aperture (cf. Sect. 3.3) around the scaling spectrum. The vertical dotted lines indicate the boundaries of the narrow-band image (15 Å = 20 layers), shown in Fig. 3. The vertical dashed-dotted lines show the position of the Hg i-sky line (Sect. 3.1).
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