Window functions for gamma-rays produced by DM annihilation, decay, and astrophysical sources across an energy range of 0.5 − 1000 GeV. The annihilation process assumes ⟨σ_annv⟩ = 3 × 10⁻²⁶ cm³ s⁻¹ (Steigman et al. 2012), where the three scenarios are considered: HIGH (purple), MID (orange), LOW (green), representing different amounts of DM concentration for subhaloes. The DM decay (black) assumes a particle decay rate of Γ_dec = 5 × 10⁻²⁸ s⁻¹, taken as a representative benchmark consistent with current limits. Both processes are modelled with the assumption of the final state in $b\overline{b}$ pairs and m_DM = 100 GeV for this figure. The contribution from unresolved blazars, which were taken as the only astrophysical source of the UGRB in this analysis, is shown in pink.