\begin{table}%t7
\caption{Summary table showing the various estimated contributions to the systematic flux error.}
\label{tab:systematics}
%\centering
\small
  \begin{tabular}{ccc}
\hline \hline
Uncertainty                        &Flux   & Index \\
\hline
MC Shower interactions             & 1\%   &       \\
MC Atmospheric sim.                & 10\%  &       \\
\hline                                             
Broken pixels                      & 5\%   &       \\
Live time                          & 1\%   &       \\
\hline                                             
Selection cuts                     & 8\%   & 0.08  \\
Background est.                    & 1\%   & 0.01  \\
Run-by-run variability             & 15\%  &  --    \\
Data set variability               &  --    & 0.05  \\
\hline
Total                              & 20\%  & 0.09  \\
\hline
\end{tabular}
\end{table}