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Martian surface spectra of H (a, b, c) and He (d, e, f) isotopes induced by primary GCR proton and 4He particles modeled via four different physics lists (Table 1). The spectra are averaged within different solid angles: (a) and (d) for the RAD view cone, (b) and (e) for the downward direction and (c) and (f) for the upward direction.
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