Distributions of Spearman’s ρ (upper) and the corresponding p-values (lower) from residual and cluster-centric distance, based on 90% (lilac), 50% (orangered), 34% (pale green), and 17% (indigo) of the Fornax main sample. The vertical grey lines denote the Spearman’s ρ and p-value from the whole Fornax main sample (i.e. from Fig. 10). The dotted black line shows the α = 0.05 significance level.