Fig. 1
The Energetic Gamma Ray Emission Telescope (EGRET) spectrum of diffuse gamma rays towards the galactic centre. The yellow area represents the contribution from the conventional background, whilst the blue area is the estimated uncertainty in the background shape from solar modulation and the cross-section uncertainties. The red area is the contribution of the gammas from theπ0 decays produced by the annihilation of a pair of 60 GeV WIMPs into mono-energetic quark pairs, each having an energy equal to the WIMP mass. Dashed lines indicate individual contributions.