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We compare the photon emission rates from hot hadronic matter with in-mediummass shift and Quark Gluon Plasma (QGP). It is observed that the WA98 data canbe well reproduced by hadronic initial state with initial temperature $\sim200$ MeV if the universal scaling of temperature dependent hadronic masses areassumed and the evolution of temperature with time is taken from transportmodel or (3+1) dimensional hydrodynamics. The data can also be reproduced byQGP initial state with similar initial temperature and non-zero initial radialvelocity.Comment: Talk given in the International Nuclear Physics Conference, at the  University of California, Berkeley, USA, during July 30 - August 3, 200

Photons from nucleus-nucleus collisions at ultra-relativistic energies