\begin{table}%t1
%\centering
\par
\caption{\label{RVs}Radial velocities of GD~687.}
\small
\begin{tabular}{lrl}
\hline\hline
\noalign{\smallskip}
mid$-$HJD & RV [${\rm km~s^{-1}}$] & Instrument\\
\hline
\noalign{\smallskip}
2~451~737.83523 & 162.9 $\pm$ 4.0 & UVES \\ 
2~451~740.76555 & 63.1  $\pm$ 4.0 &  \\
\hline
\noalign{\smallskip}
2~453~337.67383 & --40.5 $\pm$ 5.3 & EMMI \\
2~453~338.59413 &	17.4 $\pm$ 4.1 &      \\
2~453~339.61394 &	--87.6 $\pm$ 4.0	&      \\
2~453~339.67229 & --64.7 $\pm$ 4.1 &      \\
2~453~340.54050 & 130.1 $\pm$  4.7 &      \\
2~454~252.87242 & --13.5 $\pm$  11.0 &      \\
2~454~252.92242 &  82.4  $\pm$  9.8 &      \\
2~454~254.86756 &  136.3 $\pm$  11.1 &      \\
2~454~476.54549 &  162.1 $\pm$  6.3 &      \\
2~454~477.56241 &  --18.6 $\pm$  5.8 &      \\
2~454~477.65241 &  136.1 $\pm$  8.6 &      \\
\hline
\noalign{\smallskip}
2~455~144.65365 &   129.9 $\pm$  7.0  & EFOSC2 \\
2~455~144.67058 &    95.6 $\pm$  4.0  & \\
2~455~144.70520 &    25.9 $\pm$  9.1  & \\
2~455~144.72910 &   --37.1 $\pm$  7.0  & \\
2~455~144.73909 &   --31.9 $\pm$  5.1  & \\     
2~455~144.77512 &   --74.0 $\pm$  7.4  & \\     
2~455~145.53816 &   --77.6 $\pm$  7.1  & \\     
2~455~145.54772 &   --84.4 $\pm$  5.4  & \\    
2~455~145.55739 &   --83.7 $\pm$  4.0  & \\    
2~455~145.56266 &   --76.0 $\pm$  4.5  & \\     
2~455~145.56792 &   --73.4 $\pm$  3.6  & \\     
2~455~145.57774 &   --63.9 $\pm$  5.9  & \\     
2~455~145.58299 &   --65.8 $\pm$  8.0  & \\    
2~455~145.58826 &   --51.1 $\pm$  6.4  & \\     
2~455~145.59991 &   --52.4 $\pm$  5.3  & \\     
\hline
\end{tabular}
\end{table}