content_image/334842.jpg
<img src='content_image/334842.jpg'>

decay, ICS and bremsstrahlung. In principle, one should run the GALPROP code [20] to obtain Φ Galactic γ for given diffusion parameters δ , K$_{0}$ and L . Note that Φ Galactic γ is not sensitive to these given diffusion parameters as shown in Refs. [41]. For an illustration, we use the numerical results of the conventional GALPROP model (44 500180) in Ref. [42] as an estimate of our galactic gamma-ray background Φ Galactic γ . For the diffuse extragalactic gamma-ray background, one can adopt the following parametrization from the Fermi-LAT 

