Total synchrotron spectrum for σ₀ = 30 at ω_pet = 7840 (blue solid line). The dashed lines show the spectra emitted near the shock front (red) and in the far-downstream region (black). The dotted line is a pure power law which would be emitted by a p = 2.2 power-law electron spectrum, such that dE/dtdν ∝ ν^{( − p + 1)/2} = ν^−0.6. The frequency bands labeled ⓐ, ⓑ, and ⓒ refer to Fig. 11.