Superposed epoch analysis for the regular peak proton response. The differently coloured curves show the normalised 60 keV proton intensity for the 12 regular types of events, as indicated in the legend. The black solid and black dashed curves represent the mean and ±25% values, respectively. The normalisation was done at each event for the observed proton intensity value at the IP shock front. We divided the figure into two panels for better visualisation.