\begin{table}%t7
\caption{Parameters from the  second Monte Carlo simulation for~M~82.\label{tab7}}
\par
%\centerline
{\begin{tabular} {lll} \hline\hline \noalign{\smallskip}
For a scatter of 1&&\\
\hline
 Slope&         Mean&      Standard\\
  before&        slope&      deviation\\
 selection&     after &       of slope\\
 &        selection&  after selection\\
 \hline
   5.0000&   4.8057&    0.3728\\
   4.5000&   4.3656&    0.2875\\
   4.0000&   3.9091&    0.2469\\
   3.5000&   3.3846&    0.1900\\
   3.0000&   2.8901&    0.1530\\
   2.5000&   2.4197&    0.1023\\
   2.0000&   1.9249&    0.0693\\
   1.5000&   1.4611&    0.0513\\
   1.0000&   1.0035&    0.0438\\
\hline
For a scatter of 2&&\\
\hline
   5.0000&   4.2431&    0.6543\\
   4.5000&   4.0003&    0.5339\\
   4.0000&   3.5063&    0.5152\\
   3.5000&   3.1518&    0.4270\\
   3.0000&   2.7152&    0.3060\\
   2.5000&   2.2278&    0.2299\\
   2.0000&   1.7648&    0.1269\\
   1.5000&   1.3359&    0.1016\\
   1.0000&   0.8910&    0.0531\\
 \hline
\end{tabular}}
\par
%\begin{list}{}{}
\par
%\item[$^{\mathrm{a}}$] This is footnote a
\par
%\end{list}
\end{table}