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(A) Proton energy spectra in experimental setups S1 (blue) and S2 (red). The energy spectrum in S2 is composed of two parts: the low energy ( < ~ 25 MeV) from the 127.4 MeV beam and the high energy ( > ~ 25 MeV) from the 136.4 MeV beam. (B) Proton LET spectra in experimental setups S1 (blue) and S2 (red). The LET spectrum in S2 is composed of two parts: the low LET ( < ~ 2 keV/µm) from the 136.4 MeV beam and the high LET ( > ~ 2 keV/µm) from the 127.4 MeV beam.
