Cumulative distributions of distance to the centre a for each group of the SMC star cluster population: main body, wing and bridge, counter-bridge, and west halo. Left panels show ages, right panels metallicities available in the literature compilation described in the text. Black curves are the distributions of all clusters, and the colour curves represent the clusters with available parameters. The numbers in the panels are the p-values obtained by applying the Kolmogorov-Smirnov test to the black and coloured curves.