\begin{table}%t4
%\centering
\par
\caption{\label{tab:rv3}HD91204 radial-velocity data.} 
\begin{tabular}{ccc}
\hline\hline \noalign{\smallskip}
\multicolumn{1}{c}{JD}& \multicolumn{1}{c}{$RV$~(m/s)}& \multicolumn{1}{c}{$\sigma_{\rm{rv}}$~(m/s)} \\
\hline
%& & \\
2451552.102 &   172.2 &  1.5  \\
2451581.998 &   152.6 &  1.4 \\
2451706.816 &   112.0 &  1.5 \\
2451898.177 &    38.8 &  1.5 \\
2451901.157 &    29.2 &  1.5 \\
2451972.066 &     0.0 &  1.4 \\
2451973.023 &     5.4 &  1.4 \\
2451981.986 &    --4.8 &  1.3 \\
2451982.973 &    --1.0 &  1.3 \\
2451983.978 &    --4.3 &  1.4 \\
2452307.969 &  --137.3 &  1.6 \\
2452601.140 &  --254.2 &  1.5 \\
2453017.162 &  --411.7 &  1.5 \\
2453397.979 &  --570.6 &  1.4 \\
\hline
\end{tabular}
\end{table}