Cumulative 3D velocity dispersion of Sco-Cen, ordered by decreasing cluster age. The shaded orange area shows the 95% interquartile ranges (2σ bound), highlighting the uncertainties of the trend (see Appendix B.1). The symbols are coloured by the formation time of the youngest cluster included in the cumulative calculation (colour correlates with x-axis). We indicate the lookback time at the top of the x-axis, since the cumulative σ_3D could also be interpreted as the evolution of velocity dispersion over time. The four vertical grey bars indicate the four main star formation events in Sco-Cen, marking four periods of an increased star formation rate, as is discussed in R23b (see their Fig. 3).