How the SED changes when changing the input parameters. The reference values of the parameters are a = 1, ρ = 10⁶ cm, N₀ = 10¹⁵ cm⁻³, n = 2.5, γ_max = 10³. The solid lines indicate SED produced by protons; the dashed line represents SED produced by leptons. Top left panel: the changing n is shown; contrary to the incoherent case, the self-absorbed spectrum also changes slope when changing n. Top right panel: the changing the density N₀ of the particles distribution is shown. Bottom left panel: the changing the maximum electron energy γ_max is indicated. Bottom right panel: the changing ρ is represented.