Top left: observed QSO spectrum (black curve) compared to the normalized SDSS template of Vanden Berk et al. (2001) redshifted to z = 3.095 (red curve), and to the same template after enhancement of the carbon emission lines (cyan curve, see text). Bottom left: ratio of the observed QSO spectrum to the redshifted and normalized template with enhanced C lines. Right panels: enlarged portions of the QSO spectrum showing the metallic lines used to determine the redshift of the PDLA.
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