Velocity structure of metal lines tracing the overall neutral gas (top panels) compared with that seen in H₂ (bottom panels), where the transition naming is “L” for Lyman, followed by the band number (vibrational level of the upper state), the branch (corresponding to the selection function), and the rotational level of the lower state in parentheses. Downward arrows indicate the positions of the different components in the best-fit model. The absorption seen at +150 km s⁻¹ (−150 km s⁻¹) in the L1R(0) (L2R(1)) panel is not an additional component but absorption from L1R(1) (L2R(0)). The zero of the velocity scale is set relative to the redshift of the strongest metal component.