\begin{table}%t3
\caption{\label{table1}Percent of true and false detection and signal-noise ratio versus the standard deviation of the Gaussian noise on the background model.}
\par
%%\centering

\par
  \begin{tabular}{cccc}
\hline \hline \noalign{\smallskip}
Model error std dev & $\%$ of true detect & $\%$ of false detect & {\it SNR} (dB) \\
\hline
  0 & $59.3\%$ & $7.1\%$ & 23.8 \\
  10 & $57.0\%$ & $11.0\%$ & 23.2 \\
  20 & $53.2\%$ & $18.9\%$ & 22.6 \\
  30 & $49.1\%$ & $43.5\%$ & 21.7 \\
  40 & $42.3\%$ & $44.3\%$ & 21.0 \\
  50 & $34.9\%$ & $39.0\%$ & 20.3 \\
  60 & $30.3\%$ & $37.5\%$ & 19.5 \\
  70 & $25.0\%$ & $34.6\%$ & 18.9 \\
  80 & $23.0\%$ & $28.5\%$ & 18.7 \\
  90 & $23.6\%$ & $27.1\%$ & 18.3 \\  
\hline
\end{tabular}
\vspace*{5mm}
\end{table}