SOHO / ERNE (13–16 MeV) protons in the August 18, 2010 SEP event. We superpose on the intensity data in native cadence (black curve) the ten-minute time-averaged version of the data along with their nine copies, which are all shifted forward in time in one-minute intervals (rainbow-colored curves). The onset found by Poisson-CUSUM for the native data is marked with a vertical black line, and the onsets found for the ten ten-minute data time series are marked with a vertical line whose colors correspond to the time series.