We calculated the transition matrices from the cluster information of each atom along the simulation. Transition matrices are calculated by accumulating a table whose elements are the number of transitions i→j or i→i in the main diagonals that happen at each time step. We then obtain the probability for an atom to undergo a transition into another specific AE (or of remaining in the same AE) after each timestep (in dt = 1 ns in our analyses) by normalizing each row to 1. In the figures in which we show a transition matrix, we decided to represent with blank squares the transitions not observed.