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Phi meson production is studied by the NA49 Collaboration in central Pb+Pbcollisions at 20A, 30A, 40A, 80A and 158A GeV beam energy. The data arecompared with measurements at lower and higher energies and to microscopic andthermal models. The energy dependence of yields and spectral distributions iscompatible with the assumption that partonic degrees of freedom set in at lowSPS energies.

Energy dependence of phi meson production in central Pb+Pb collisions at sqrt(s_nn) = 6 to 17 GeV