  The usual interpretation of Bose-Einstein correlations (BEC) of identical
boson pairs relates the width of the peak in the correlation function at small
relative four-momentum to the spatial extent of the source of the bosons.
However, in the tau-model, which successfully describes BEC in hadronic Z
decay, the width of the peak is related to the temporal extent of boson
emission. Some new checks on the validity of both the tau-model and the usual
descriptions are presented.
