  The currently available set of hadron abundances at the SPS for central
S+Au(W,Pb) collisions is compared to predictions from a scenario assuming local
thermal and hadrochemical equilibrium. The data are consistent with a
freeze-out temperature T = 160-170 MeV. Spectra are consistent with this
temperature range and a moderate transverse expansion. The freeze-out points at
the AGS and SPS are found to be close to the phase boundary between a hadron
gas and an ideal quark-gluon phase.
