VHE γ-ray (ε_γ ∼ 10⁻²−10³ TeV) injection model. (a) Distribution of the angle between the initial emission axis and the momentum vector angle of surviving unattenuated photons and secondary cascade photons at ε_γ > 10 GeV, after propagation in the magnetized region. (b) PDF of the time-delay distribution of secondary photons emerging from the magnetized region with respect to the rectilinear travel time. (c) The blue solid line shows the secondary γ-ray spectrum after propagation through the magnetized structure, while the red dashed line shows the γ-ray spectrum at Earth The fluxes are normalized to one injected γ-ray photon. In both panels, spectra are shown within a 1° viewing aperture at the structure boundary and at Earth.