Segmental spectral contributions of protons to the HPU1 doses and BFO doses inside MPCV. (a) Band spectra of 9 subevents in 1989 (Raukunen et al., 2018). (b) Contributions of protons at different energies to the total HPU1 doses of the 9 events. (c) Contributions of protons at different energies to the total BFO doses for a FAX phantom at seat 1 of the 9 events. (a) and (b) are adapted from Figure 3 in Hu et al. (2020).