Intensity curves as a function of frequency for a single time. The panels in the left column show the emission spectra in the case ζ = 30 of the electrons injected with spectral indices δ = 2 (black solid line) and δ = 3 (red dashed line). In contrast, the right column depicts the equivalent results in the case ζ = 70. Vertical lines mark the roll-over (or peak) frequencies. All spectra were recorded approximately 32 minutes into the simulation, which is about 3 minutes after the injection of the electrons.