\begin{table}%t4
%\centering
 \caption{Integrated emissivities for an Earth-like
spectrum. Values are in units of photons  cm$^{-3}$ s$^{-1}$.\label{integr}}
\begin{tabular}{l c c c }
\hline\hline
Parameterization/Approx. & $E>100$ Mev & $E>100$ GeV  & $E>315$ GeV\\
\hline
Blattnig et~al.     &    3.2E-25      &        2.2E-28 & 4.7E-29\\
Kamae et~al.        &    4.8E-25      &        1.8E-29 & 2.6E-30\\
Aharonian           &    4.0E-25      &        2.2E-29 & 3.1E-30\\
Stephen and Badwhar (from Blattnig et~al.) &    2.2E-25      &        1.8E-31 & 1.9E-33\\
\hline
\end{tabular}
\end{table}