Distribution statistics for the 3-minute time-averaged data of STEREO-A / SEPT 85–105 keV electrons on the 2021-04-17 SEP event. The corresponding onset times are displayed on top of the time series in Fig. 3 and as a histogram in Fig. 4. The figure here shows the median (red), mode (blue) and the mean (orange) of the distribution as vertical lines and the ∼68 % (purple) and ∼95 % (blue) confidence intervals of the distribution as shadings. The chosen background for the method is seen on the left of the figure as light red shading.