Top: cosmic ray, neutrino (summed over all flavors) and photon spectra assuming three compositions: pure proton, pure helium and pure iron at the source, a source spectral index β = 2.0 and a maximum energy at the source E_max(Z) = Z × 10^20.5 eV. The same cosmic ray luminosity between 10¹⁶ eV and E_max(Z) is assumed. The contribution of the main fragment is shown in thin dashed lines. Bottom: same as top panel but assuming a source spectral index β = 2.3.