Rotation velocity (left) and velocity dispersion (right) profiles across the major kinematic axis for the HATLAS090750 (top), HATLAS114625 (middle), and HATLAS121446 (bottom) galaxies. The errorbars show the 1-σ uncertainties. The vertical black-dashed line represents the best-fit dynamical centre. The light grey shaded area represents the 3× synthesized beam size region centred at the best-fit molecular gas dynamical centre, whereas the dark grey dashed area represents the 3× PSF FWHM zone centred at the best-fit ionized gas dynamical centre. In the rotation velocity profile panels, the dashed-magenta and solid-green curves show the rotation curves extracted from the beam-smeared Paα and CO(1–0) two-dimensional best-fit models, respectively. In the velocity dispersion profile panels, the green- and magenta-dashed lines show the median galactic value estimated from the outskirts of the galactic disc (Table 4) for the CO(1–0) and Paα observations, respectively. We find a good agreement between the rotation curves derived from the ionized and molecular gas ISM phases in the three starbursts.