Top panel: multiwavelength light curves from radio, optical, X-ray, and VHE band at 500 GeV in the EIC scenario. The data shown are the same as in Figure 1. We include late-prompt emission consisting of extended and plateau emission fitted with Equations (1) and (2), and VHE γ-rays from the EIC process. Middle panel: same as Figure 1, but we show the broadband spectra for t_obs = 10^3.6–10⁴ s. Bottom panel: Compton Y parameter, Y_SSC (dashed line) and Y_EIC (dashed–dotted line), as a function of electron Lorentz factor γ_e; the blue solid line is the Y_SSC estimated in the Thomson regime. The physical parameters are ﹩{{ \mathcal E }}_{k}=2\times {10}^{51}\,\mathrm{erg}﹩, Γ₀ = 60, n_ex = 0.1 cm⁻³, ϵ_e = 0.5, ϵ_B = 10⁻⁶, f_e = 0.1, s = 2.5, and θ_j = 0.1.