Time evolution of all combinations of inter-aggregate 3D distances. Darker colors trace the forward integration (t > 0), while lighter colors are for the backward integration. Median distances are shown as solid lines, with shaded areas being the 16th (lower distance) and 84th (upper distance) percentiles of the 3D distance distributions from multiple initial condition extractions. The vertical gray area delimits the stellar age ranges, from 5 Myr (for W345 complex star clusters) to about 30 Myr for LISCA II (see Della Croce et al. 2023).