Contributions from different radiative processes to the SED of VER J0521+211 (state A), in a lepto-hadronic scenario where protons are co-accelerated to ⪆10 PeV. The solid line shows a total radiated photon flux, same as in Fig. 5 (upper left panel). Dashed lines correspond to the following contributions: purple – synchrotron radiation from electrons accelerated in the jet, blue – synchrotron radiation from pairs created in Bethe-Heitler process, orange – SSC emission, red – synchrotron radiation from γγ pair creation, green – synchrotron from electrons created in hadronic cascades following pγ interactions, cyan – inverse Compton Bethe-Heitler electrons, and magenta – pion decay to γγ. Neutrinos are shown with dash-dotted filled curve.