Radial profiles of the γ-ray emissivity for the southern parts of the excess. For comparison, we show the constant (solid curves), 1 /r (dotted curves), and 1 /r² (dot-dashed curves) profiles, which are predicted by the impulsive injection, continuous injection, and the transport through wind, respectively. Left panel: emissivity per hydrogen atom related to interactions with gas (i.e. inelastic interactions of protons and ions or bremsstrahlung of electrons). Right panel: γ-ray emissivity due to IC normalized to the density of ISRF 1 eV/cm³.