Two-component Gaussian fit (blue thick line) of CRISTAL-02 emission profile along each column in the position-velocity (p-v) diagram (grey lines) extracted along the kinematic major axis. The underlying p-v diagram from which the profiles are extracted is shown in Figure A.6 in the Appendix A. We assumed the narrow component (red) to trace the bulk rotation motion of the gas, which was then used for subsequent kinematics modelling, while the broad component (orange) is associated with the outflow and the interacting companion in the north (at offset $\gtrsim 0\stackrel{″}{.}8$). For other galaxies, we assume a single Gaussian profile using the same extraction method.