Assembly histories for individual clusters (summarised in the PC₁ − PC₂ plane) colour-coded according to each of the assembly state indicators at z = 0. The colour bars are ordinal (i.e. linear in the ranked variable: e.g. the middle point of the colorbar corresponds to the median value). At the top of each panel, we indicate the direction of maximum correlation with the indicator, the Spearman rank correlation coefficient, and the Kendall rank correlation coefficient.