\begin{table}%t2
%\centering
\par
\caption{Radial-velocity measurements and error bars for Gl~581. All 
values are relative to the solar system barycenter. }
\label{TableRV}
%\centering
\par
\begin{tabular}{c c c}
\hline\hline
  JD-2~400~000 &   $RV$ &   Uncertainty \\
 &   [km~s$^{-1}$] &  [km~s$^{-1}$] \\
\hline
53152.71289&  $-$9.2235 & 0.0012\\
53158.66336&  $-$9.2319 & 0.0014\\
53511.77355&  $-$9.2202 & 0.0014\\
53520.74475&  $-$9.1999 & 0.0016\\
53574.52223&  $-$9.2024 & 0.0013\\
53575.48075&  $-$9.2069 & 0.0011\\
53576.53646&  $-$9.2202 & 0.0011\\
53577.59250&  $-$9.2221 & 0.0014\\
53578.51061&  $-$9.2108 & 0.0010\\
53578.62960&  $-$9.2092 & 0.0013\\
53579.46256&  $-$9.1991 & 0.0011\\
53579.62115&  $-$9.1970 & 0.0012\\
53585.46167&  $-$9.2034 & 0.0013\\
53586.46516&  $-$9.2141 & 0.0010\\
53587.46481&  $-$9.2269 & 0.0020\\
53588.53827&  $-$9.2179 & 0.0036\\
53589.46202&  $-$9.2051 & 0.0010\\
53590.46379&  $-$9.1990 & 0.0010\\
53591.46638&  $-$9.2034 & 0.0010\\
53592.46481&  $-$9.2175 & 0.0010\\
\hline
\end{tabular}
\end{table}