Time evolution of the SED for model HEL2-C produced using the evolving particle spectra with an initial power-law index p = 6 when observed from a direction inclined at 20° with the jet axis. Lines with t/t_a = 3.0, 3.75, and 4.5 are shown in the left panel for the synchrotron emission, and the corresponding IC emission is shown in the right panel. The frequency, flux, and time have the same normalization as in Fig. 8.