Simulated kinetic energy of the particles as function of the resulting energy deposition in the detector. Simulation results for forward-penetrating electrons (triangle, right axes), protons (squares), and helium particles (circles) are shown. In addition, calculations based on the Bethe-Bloch equation (dashed lines) and fit results (solid lines) for the ions are presented. The shaded area marks energy losses that are most propably caused by protons.