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Martian surface spectra of H (panel a) and He (panel b) isotopes induced by primary GCR proton and 4He particles modeled via four different physics lists (Table 1). The spectra are averaged within 36° of downward zenith angle corresponding to the RAD view cone. (a) Input: GCR H + 4He, output: downward H isotopes, (b) input: GCR H + 4He, output: downward He isotopes.
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