Fig. 10.
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Velocity offsets of H I 21 cm and CO absorption lines. The zero of the velocity scale corresponds to z21. For H I, both the extent of the full and secondary absorption are shown. The vertical ticks mark the location of H I and CO absorption peaks, and the systemic velocity – except for PKS 1200+045 – based on optical emission lines is shown with a star ⋆.
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