Single-particle spectra and two-particle correlation functions measured by
the NA49 collaboration in central Pb+Pb collisions at 158 GeV/nucleon are
presented. These measurements are used to study the kinetic and chemical
freeze-out conditions in heavy ion collisions. We conclude that large baryon
stopping, high baryon density and strong transverse radial flow are achieved in
central Pb+Pb collisions at the SPS.Comment: Latex file, 12 pages, 5 figures. Invited talk given at the "XXVIII
International Symposium on Multiparticle Dynamics
