Visualisation of the two-dimensional minimum spanning tree (MST) for numerical cluster models with different initial mass segregation parameters S (see Sect. 2.2). The solid blue lines (connecting the small black dots and large red dots) represent the MST of the entire population. The red dashed lines (connecting the large red dots) represent the MST of the ten most massive particles. Top: S = 0.1. Bottom: S = 0.9.