Normalised differential energy distributions of electrons, positrons, and γ-rays as products of decays of π-mesons for three different energies of the incident protons T_p = 0.3, 0.6, and 1 GeV computed using Geant4. At low energies, the electron production is severely suppressed (the corresponding curves do not appear on the plot), while at T_p = 1 GeV the contributions of electrons and positrons become comparable. The label on the top of each histogram shows the relevant channels.