Gamma-ray spectra of EIC emission from the GRB afterglow with the plateau X-ray emission at T = 10 ^2.6 s (thin) and T = 10 ^3.6 s (thick). For comparison, synchrotron and SSC emission from the standard afterglow component are also shown. The source redshift is set to z = 0.3. Relevant parameters for the late jet are L ^b _LP| _{T′ a} = 10 ^48.5 erg s ⁻¹, T′ _a = 10 ³ s, E′ ^b = 0.1 keV, α _fl = 0, and α _st = 10. Relevant parameters for the standard afterglow component are the same as those in the caption of Figure 3. The attenuation by pair creation both inside and outside the source is taken into account.