Proton spectra for five intervals during the SIR-related energetic particle event observed by PSP/IS⊙IS on DOY 320of 2018. Red and blue symbols represent low and high energy instruments, respectively, and spectral fits are indicated bydotted black lines. Error bars (often smaller than the symbols) show the statistical uncertainty. To combat the reduced statistics of the triple coincidence EPI-Lo data, re-binning is applied following background subtraction such that each plotted point has at least two counts.