Results from the Dressler-Shectman (DS) test. The plots show the spatial location of the cluster member galaxies. The radii of the plotted circles are proportional to e^δ, where δ is the DS measurement of the local deviation from the global velocity dispersion and mean recessional velocity, i.e. larger symbols correspond to a higher significance of residing in a substructure. The colours indicate the rest-frame velocity relative to the subcluster centre, ranging from red (receding; 1500 km s^-1) to blue (approaching; −1500 km s^-1). The black crosses indicate the subcluster centres. P is the probability of there being no substructure in the dataset. Except for the SW-group, each of the other 3 subclusters shows a high significance for substructure. The significant substructures and non-Gaussian redshift distributions indicate that the cluster system is dynamically young and not in a virialised state.