Influence of the log-parabola width â on the MFPs and energy loss lengths in the comoving frame for carbon (left panel) and iron (right panel) nuclei of Lorentz factor γ. The peak luminosity is set to L_pk = 10⁴⁸ erg s⁻¹ and two examples of widths are presented: â = 0.25 (blue) and â = 0.03 (red). The different line styles correspond to different processes: photonuclear (solid), inverse Compton (dashed), Bethe–Heitler (dotted), and synchrotron (double dot-dashed). The black long-dashed line corresponds to the typical comoving size of the region. Wider SED lead to larger MFPs.