Radial velocity histograms for different colour intervals, corresponding to different cluster populations (see text). Typical uncertainties are of the of order 50–80 km s^-1 (compare Fig. 2). The vertical dotted line indicates the systemic velocity. The dotted histogram in the left panel is the velocity histogram of Goudfrooij et al. (2001b), where the two velocity peaks already are discernable. We interpret the peak at 1800 km s^-1 as the expected peak at the systemic velocity. The peak at 1600 km s^-1 is caused by a dominance of clusters with this velocity in the western part of NGC 1316.