  We provide a set of microlensing optical depth maps for M31. Optical depths
towards Andromeda were calculated on the basis of a four component model of the
lens and source populations: disk and bulge sources lensed by bulge, M31 halo
and Galactic halo lenses. We confirm the high optical depth and the strong
optical depth gradient along the M31 minor axis due to a dark halo of lenses
and also discuss the magnitude of the self-lensing due to the bulge. We explore
how the shape of the optical depth maps to M31 vary with the halo parameters
core radius and flattening.
