The γ-ray flux from within a 6° radius emission region for Iroshnikov–Kraichnan turbulence (δ = 1/2), assuming that t_age = 1 Myr. The black line shows the summation of our model and diffuse Galactic γ-ray fluxes, while the latter is shown by the blue dashed–dotted–dotted line. The red flux points for a 6° radius bubble are taken from LHAASO Collaboration (2024). The diffusion coefficient normalization D₀ = 3 × 10²⁹ cm² s⁻¹, the CR injection spectral index s = 2.45 and its cutoff energy E₀ = 10 PeV, the gas distribution is nonhomogeneous and is given by Equation (12) with n₀ = 1 cm⁻³ and z_c = 300 pc, and the CR injection kinetic power above 1 TeV is ﹩{\dot{W}}_{{\rm{CR}}}(\gt \,{\rm{1}}\,\,\,{\rm{TeV}}\,)=5.6\times 1{0}^{38}\,{\rm{erg}}\,{{\rm{s}}}^{-1}﹩.