  Bose-Einstein correlations of pairs of identical charged pions produced in
hadronic Z decays are analyzed in terms of various parametrizations. A good
description is achieved using a L\'evy stable distribution in conjunction with
a model where a particle's momentum is correlated with its space-time point of
production, the \taumodel. Using this description and the measured rapidity and
transverse momentum distributions, the space-time evolution of particle
emission in two-jet events is reconstructed. However, the elongation of the
particle emission region previously observed is not accommodated in the
\taumodel, and this is investigated using an \adhoc/ modification.
