Four CO lines, with the C I, H₂O_p(2,0,2 − 1,1,1) and [NII] lines. All spectra are from the IRAM-30 m, except for the CI/CO(7–6) from the PdBI, and CO(2–1) from EVLA. Upper vertical lines indicate the red (R) or blue (B) components for CI, and lower vertical lines indicate the same for all others. All panels have the same velocity scale (translated for CO(5–4) and CO/CI). The blue component of the [NII] line is much stronger and broader than for the CO lines, suggesting a strong ionized gas flow. Exact velocities are detailed in Table 2.