ambient electron (left) and photon spectra (right) for various z_b (in R_g) with respect to the reference model. The total injected electron energies for z_b = (1000,2000,3000,4000) are Υ_inj = (0.9,1,1.04,1.06). For z_b = 1000, the IC photon components produced by the two target photon fields are also shown separately.