One-zone hadronic models applied to 13 June (left panel) and 14 June (right panel) 2016. The symbols corresponding to the data from different instruments are given in the legend. Solid black line: summed; dashed blue line: electron-synchrotron; dotted green line: SSC; dot-dashed sea green line: proton-synchrotron; dot-dot-dashed orange line: p − γ cascade. The higher energy peak in the SED is dominated by synchrotron radiation by relativistic protons, which can be achieved with B ∼ 100 G and E_p, max >  10¹⁸ eV and jet power L_j ∼ 10⁴⁶ erg s⁻¹ (∼L_Edd). For more details see the discussion in Sect. 4.3.2 and the parameters in Table 4.