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Single-ion energy deposition spectra for different ions (1000 MeV protons, 250 MeV/n helium, 290 MeV/n carbon, 325 MeV/n oxygen, 300 MeV/n silicon, and 1000 MeV/n iron ions) and target radii (1, 2, 4, and 8 µm). Contributions: direct (– –), dashed (- - -), total (⋅ ⋅ ⋅). Due to the large differences between the direct and indirect contributions at almost all energies, the total contributions overlap with the direct or indirect contribution, whichever is largest.
