Proton spectra of the SEPs on 2019 May 6 and the background spectra which are averaged between April 29 and May 3. The left panel shows the spectra including the background and the right panel shows the SEP spectra with background subtracted. Different shaded areas indicate the energy ranges covered by the different instruments from ∼300 keV to ∼30 MeV. More details can be found in the text of Section 2.3.