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Fig. 6.


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4He and 3He (scaled by 0.1) spectra for zenith angles smaller than 30° on the Martian surface measured between 19 August 2012 and 17 February 2013 by MSL-RAD (black, Ehresmann et al. 2014) and calculated for the same period by different simulation tools: GEANT4 (red), PHITS (blue), OLTARIS2013 (green), HZETRN/OLTARIS (ocher). The data have been scaled by the factors given in parentheses.

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