Understanding limitations in the determination of the diffuse Galactic   gamma-ray emission
  We discuss uncertainties and possible sources of errors associated with the determination of the diffuse Galactic gamma-ray emission using the EGRET data. Most of the issues will be relevant also in the GLAST era. The focus here is on issues that impact evaluation of dark matter annihilation signals against the diffuse gamma-ray emission of the Milky Way. 
I. V. Moskalenko (Stanford), S. W. Digel (SLAC), T. A. Porter (UCSC),   O. Reimer (Stanford), A. W. Strong (MPE)