Time-integrated spectra following the same structure as in Fig. 4. The spherical effects decrease the peak frequencies for both shocks, with a stronger effect on the RS. The peaks from both contributions are closer than in the planar case, resulting in a three-part spectrum. This effect is more visible with the broken power-law spectral shape where the two peaks are distinct from each other in the hybrid approach. The choice for the spectral shape also diminishes the flux at low frequencies.