Electron spectra after taking into account energy losses. The solid and dashed lines refer to the downstream and upstream regions respectively and the spectra are normalised to a total energy in accelerated protons of 10⁶² erg in the volume of the cluster. a) Spectra obtained considering pure synchrotron cooling in a magnetic field B₁ = 0.3 μG upstream and B₂ = 1.2 μG downstream. b) Same as in panel a) but with the realistic combination of IC and synchrotron losses as in Fig. 5.