PV diagrams for NGC 864 from the low-resolution GHαFaS velocity data. (a) PV along the kinematic major axis (PA = 20°, counterclockwise from north); (b) PV along an intermediate angle (70°); and (c) PV along the kinematic minor axis (PA = 110°). Contour levels are at 0.5σ, 1.5σ, 4.5σ, 13.5σ and 25σ. Overlaid (grey dots) is the velocity profile for the whole disc at the corresponding angle and the systemic velocity (dash–dot–dashed line) corresponding to a velocity of 1562 km s⁻¹.