Event-by-event fluctuations of the average transverse momentum Pt (a measure of the temperature in the event) and of the ratio of the produced numbers of Kaons and pions (a measure of the flavor content of the event) in central Pb+Pb collisions at the SPS (red data points) are reduced to the level of finite particle number statistics ( blue curves ). This lack of dynamical fluctuations indicates equilibration within the produced hadronic matter, as expected if the reaction proceeded through a quark-gluon- plasma stage.