Fig. 18
Schematic view of the positions of the PDLA, LAB, and QSO along the velocity axis. The PDLA redshift (determined with metallic lines) was adopted as the origin because of its excellent precision. The QSO lies beyond the LAB, while the asymmetry of the LAB emission line would suggest the reverse when we assume the model of a QSO that is surrounded by an expanding medium.
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