Position-velocity diagrams along the kinematic major (upper panels) and minor axis (bottom panels) for the disk Petunia at 60 deg. The horizontal axis shows the offset from the galaxy center, and the vertical axis represents the line-of-sight velocity centred at the systemic velocity of the galaxy. From left to right, the high S/N ALMA mock data at high-, medium- and low-angular resolutions are shown. The black and red contours show the data and the ^3DBAROLO model, respectively. The level contours are at −2.5, 2.5, 5 and 10 times the rms noise. The orange circles show the best-fit rotation velocities (not corrected for inclination) derived using ^3DBAROLO.