  Bose-Einstein correlations in relativistic heavy ion collisions and their
dependence on the freeze-out condition in hydrodynamic models is compared to
time-like freeze-out, where particles are emitted away only from the surface,
i.e. space- vs. time-like freeze-out. The corresponding HBT radii are
calculated for the two models emphasizing the difference in the outward HBT
radius.
