Line-of-sight velocity against projected radius. The sample is centered on the systemic velocity of 1760 km s^-1 (Longhetti et al. 1998). Solid red objects have been assigned membership in NGC 1317 with  >90% probability. The hollow red dots are ambiguous – they could not be assigned to either galaxy with more than  >90% probability. There are some extreme-velocity objects near the center of the filter (779 km s^-1) and around 2700 km s^-1 that may be background galaxies.