We have analysed the invariant mass distribution of dileptons in S+W
collisions at 200A GeV as measured by the HELIOS-3 collaboration at CERN SPS.
Three scenarios were considered where the collision lead to formation of (i)
the quark-gluon plasma, (ii) the ideal hot hadron gas and (iii) the viscous hot
hadron gas. The space-time evolution was governed by the minimal extension of
the Bjorken hydrodynamics. All the three scenarios indicate excess dileptons in
the experiment.Comment: 7 pages text and 6 figure