Smoothed projection profiles for the tips (normalized against the peak length of each event) of the three EB segments analyzed in Case Study: I (top) and three other independent EBs (bottom). Each event is plotted through its full lifetime. The top panel highlights the parabolic evolutions of each small segment, indicative of a repetitive driver. These profiles are similar to the majority of EB events, represented by the dashed and dot–dashed lines in the bottom panel.