Velocity (Moment-1) and dispersion (Moment-2) maps of the galaxy COS2987 (with respect to the observed frequency of [C II] at redshift z = 6.8076) are shown in the left and right panels, respectively. The black contours correspond to the 2-, 4-, 6-σ levels of the [C II] integrated (moment-0) map. In the right panel, we plot the position-velocity diagram of slits 1 and 2, shown on the left panel as dashed lines. The black contours correspond to the 2-, 3-, and 4-σ levels of the position-velocity diagram.