Indications of the onset of deconfinement at low SPS energies

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We present evidence for an onset of deconfinement at low SPS energies obtained by the NA49 experiment in central Pb+Pb collisions in an energy scan from 20 to 158 AGeV. As indicators for such an onset, the independence of mean mt on beam energy, a sharp peak in the strangeness-to-pion ratio and dynamical fluctuations in the event-by-event K/π ratio are discussed.