γ-ray spectrum of the Cygnus Loop extracted with the X-ray template and modeled emission in the DSA scenario. Solid lines show the total contribution of Bremsstrahlung radiation, IC, and π⁰ -decay. The total energy (W_tot = 1.2 × 10⁴⁹ erg), the electron-to-proton ratio (K_ep = 0.01 at 10 GeV), and the break energy (p_br = 62 GeV/c) are fixed. Different cutoff energy values are shown.