The invariant direct photon multiplicity for central 158 AGeV ^{208}Pb+^{208}Pb collisions. The error
bars indicate the combined statistical and systematical errors. Data points with downward arrows indicate unbounded
90% CL upper limits. Results of several direct photon measurements for proton induced reactions have been scaled
to central ^{208}Pb+^{208}Pb collisions for comparison.
Published in Phys. Rev. Lett. 85 (2000) 3595
