CO(6−5) kinematics. All velocities are with respect to z = 1.9212 (EM11). Top left: 1st moment velocity map of the CO(6−5) emission, with overlaid contours of the CO(6−5) total intensity at the same levels as those shown in Fig. 2. Also indicated are four pseudo-slits along which we extracted the position-velocity plots shown in the middle and bottom (solid for the robust +0.5 weighted data and dashed for the uniform weighted data). The width of the pseudo-slits indicates the spatial resolution. Top middle: position-velocity plot of the robust +0.5 weighted CO(6−5) data set, which highlights the bridge-like structures between NW and SE at v< −250 km s^-1 and v ~ 0 km s^-1 (PA = −41°; direction SE to NW). Contour levels: –4, –3, 3, 4, 5, 6, 7, 8, 9σ, with σ = 0.54 mJy beam^-1. For guidance, along the y-axis we plot the velocity coverage of the Gaussian model components shown in the spectra on the right. Bottom: position-velocity plots derived from the uniform weighted CO(6−5) data, which best show the kinematic details (beamsize 0.27′′ × 0.23′′ at PA_beam = 57°). The PV-plots are taken along the dashed axes indicated in the top-left plot and all offsets are shown from (north/south)-east to (south/north)-west. Contour levels: –3, –2, 2, 3, 4, 5, 6, 7σ, with σ = 0.88 mJy beam^-1. Right: CO(6−5) spectra of the three components (NW, SE and C). The redshifts z_CO(1−0) (EM11) and z_HeII (EM15), and their uncertainty, are indicated with an arrow + bar. Also shown are the best-fit model (solid red line) and corresponding individual components (solid black Gaussians lines), as well as an alternative model for NW (dotted lines); see text for details.