  It has been shown recently that the values of $J_T$ and $J_L$ which appear in
Eqs.(2) and (5) of the above paper and which are taken from the work of
Aurenche et al are too large by a factor of 4. Correcting for this changes the
Fig.~2. More-over, now the emissions from the quark matter dominate only for
$p_T <$ 1 GeV/$c$. The basic result of the paper, that the upper limit of the
single-photon production in the WA80 experiment is consistent with the rates
for photon production at two-loop level remains valid.
