The histogram shows the peculiar velocity distribution of the 50 galaxies within | v_pec | < 3500 km s^-1 and ~ 550 kpc of the tip of the NE X-ray feature. The green vertical lines show the v_pec positions of each of the 50 galaxies. The solid red and dashed red lines show the main and second Gaussian components from the KMM fit described in Sect. 3.3. The best fitting mean and dispersions are listed at the top left of the plot, along with the P-value giving the probability that the observed LRTS of the bimodal to the unimodal fit is due to random fluctuations in a unimodal distribution.