\begin{table}%t3
%\centering
 \caption{The effect of the medium gas density on the
$\gamma$-ray integral fluxes. Results provided are in units of
photons cm$^{-2}$~s$^{-1}$, and already take the opacity to photon
escape into account.\label{density}}
\begin{tabular}{llll }
\hline\hline
$F(E > E_{0})$   &   $n=300$ cm$^{-3}$  &  $ n=600$ cm$^{-3}$  &  $ n=1200$ cm$^{-3}$   \\
\hline
$E_{0}=100$ Mev  &  2.22E-8   &  2.32E-8   &  2.37E-8    \\
$E_{0}=200$ Gev  &  1.20E-12  &  1.60E-12  &  1.95E-12   \\
$E_{0}=600$ Gev  &  2.60E-13  &  3.61E-13  &  4.52E-13   \\
$E_{0}=1$ Tev    &  1.26E-13  &  1.78E-13  &  2.26E-13   \\
$E_{0}=2$ Tev    &  4.36E-14  &  6.29E-14  &  8.09E-14   \\
\hline
\end{tabular}
\end{table}