Angular profiles of the images of the sources represented in Fig. 7. We represent the gamma-ray flux integrated over energies E_γ = 1−100   GeV averaged over angular bins, for a filament seen along its axis, at 1 Gpc and L_E,19 = 10⁴⁶ erg s^-1 (black solid line), and at 100 Mpc and L_E,19 = 10⁴⁴ erg s^-1 (green dashed line). The black stars and green crosses present the corresponding integrated flux up to a given angular extension in the sky θ.