\begin{table}%t1
%\centering
\par
\caption{ELODIE and SOPHIE radial velocities of HD~43691. All values are relative to the solar system barycentre. The uncertainties correspond to the photon-noise errors.}
  \label{rad_vel1}
\begin{tabular}{ccc}
\hline
\hline
\noalign{\smallskip}
JD $-$ 2~400~000 & $RV$              & Uncertainty     \\
$[$days$]$         & $[$km~s$^{-1}]$ & $[$km~s$^{-1}]$ \\
\noalign{\smallskip}
\hline
\multicolumn{3}{c}{ELODIE measurements} \\
\hline
\noalign{\smallskip}
53~333.6255 & $-$29.123 & 0.011 \\
53~337.6057 & $-$29.098 & 0.012 \\
53~398.4118 & $-$29.015 & 0.012 \\
53~690.6694 & $-$28.945 & 0.013 \\
53~692.6430 & $-$28.962 & 0.013 \\
53~693.6240 & $-$28.983 & 0.014 \\
53~714.5653 & $-$28.912 & 0.014 \\
53~715.5590 & $-$28.903 & 0.015 \\
53~718.5549 & $-$28.904 & 0.013 \\
53~719.5681 & $-$28.885 & 0.010 \\
53~720.5323 & $-$28.853 & 0.017 \\
53~721.5123 & $-$28.892 & 0.018 \\
53~722.5237 & $-$28.907 & 0.015 \\
53~728.4315 & $-$28.969 & 0.018 \\
53~749.5333 & $-$28.989 & 0.014 \\
53~750.4982 & $-$28.958 & 0.014 \\
53~756.4444 & $-$28.840 & 0.018 \\
53~808.2808 & $-$29.091 & 0.012 \\
53~809.2850 & $-$29.087 & 0.009 \\
53~839.3031 & $-$28.960 & 0.019 \\
53~870.3405 & $-$28.881 & 0.017 \\
53~872.3456 & $-$28.923 & 0.020 \\
\noalign{\smallskip}
\hline
\multicolumn{3}{c}{SOPHIE measurements} \\
\hline
\noalign{\smallskip}
54~044.6274 & $-$28.980 & 0.003 \\
54~051.6411 & $-$28.830 & 0.004 \\
54~053.5968 & $-$28.854 & 0.003 \\
54~078.6009 & $-$29.059 & 0.004 \\
54~079.4859 & $-$29.040 & 0.004 \\
54~080.4572 & $-$29.018 & 0.004 \\
54~081.4440 & $-$28.993 & 0.003 \\
54~087.4744 & $-$28.858 & 0.004 \\
54~088.5858 & $-$28.872 & 0.004 \\
54~089.6137 & $-$28.846 & 0.004 \\
54~142.4798 & $-$29.064 & 0.004 \\
54~148.4607 & $-$29.089 & 0.004 \\
54~151.4010 & $-$29.065 & 0.004 \\
54~155.4284 & $-$28.981 & 0.004 \\
\noalign{\smallskip}
\hline
\end{tabular}
\end{table}