Free space GCRs spectrum in Mars surrounding from 19 August 2012 to 17 February 2013 (corresponding to $\bar{\mathrm{\Phi }}=599 \mathrm{MV}$). The BON20 model is shown by solid lines while DLR model is represented by dotted lines. Due to different approaches (numerical for BON20, empirical for DLR) and input parameters (Liu et al., 2024), those two models differ significantly at low energies for most particles (for energies below 100-200 MeV). As detailed in 3.3.3, most particles of these energies do not reach the surface, as the Martian atmospheric cut-off is about 160 MeV for protons, for instance. Differences also exist at higher energies for heavier ions with lower GCR abundances compared to H and He. Plotted with data extracted from On-Line Tool for the Assessment of Radiation in Space (OLTARIS).