  Recently published empirical abundance maps, obtained through (Zeeman)
Doppler mapping (ZDM), do not currently agree with the abundance structures
predicted by means of numerical models of atomic diffusion in magnetic
atmospheres of ApBp stars. In a first step towards the resolution of these
discrepancies, we present a state of the art grid of equilibrium abundance
stratifications in the atmosphere of a magnetic Ap star with T_eff = 10000 K
and log g = 4.0. A description of the behaviour of 16 chemical elements
including predictions concerning the over- and/or under-abundances over the
stellar surface is followed by a discussion of the possible influence of
presently neglected physical processes.
