Kinematic structure of HZ4 as traced by the [C II] line emission. Top: [C II] velocity field (left) and velocity dispersion map (right) of HZ4. The ALMA synthesized beam (θ = 0.39″ × 0.34″) is shown in the bottom-left corner. Bottom: rotation curve and velocity dispersion profiles extracted employing a pseudo-slit oriented along the kinematic major axis shown by the gray solid line in the upper panels, where the kinematic center is shown with a gray cross. The solid black line in both panels represents the best-fit DYSMAL model beam-convolved to the observed space.