  In this note we comment on a recent publication in this journal by the CERES
(NA45) Collaboration. The authors report to have determined an upper limit on
the direct photon yield relative to the decay photon yield in S+Au collisions
of 14 % and 7 % by two different methods, respectively. We argue that these
limits are unsupported by the results and analysis of the CERES data. The
systematic error estimates quoted in the CERES analysis are consistently overly
optimistic. Using more realistic estimates of the various error contributions
and propagating them appropriately we arrive at a direct photon upper limit
which at best is 20% of the inclusive photon yield, and most probably is much
higher.
