Onset delay (type III to electron onset) as a function of the rise time of the events. Panel a) shows only measurements of class (1), b) of class (2), and d) of class (3). Panel c) combines class (1) and class (2) events. The Pearson correlation coefficient of each group is presented at the top right of each panel, the solid line represents the corresponding fit. The value in brackets of panel b) describes the correlation if the yellow point to the right is excluded, the value in brackets in panel d) is the correlation when excluding the top cyan point. The dashed line corresponds to these correlations.