\begin{table}%t4
%\centering
\par
  \caption{Orbital elements for the best Keplerian solution of HD~43691
             and HD~132406, as well as the inferred planetary parameters.}
  \label{orb_elem}
  $$
\begin{tabular}{l r@{ }l r@{ }l l}
\hline
\hline
\noalign{\smallskip}
 & \multicolumn{2}{c}{HD~43691} & \multicolumn{2}{c}{HD~132406} & \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
$P$                  & 36.96     & $\pm$ 0.02  & 974       & $\pm$ 39    & [days]                \\
$T$                  & 54046.6   & $\pm$ 0.5   & 53474     & $\pm$ 44    & {\scriptsize [JD $-$ 2~400~000]}  \\
$e$                  & 0.14      & $\pm$ 0.02  & 0.34      & $\pm$ 0.09  &                       \\
$V$                  & $-$29.000 & $\pm$ 0.003 & $-$37.840 & $\pm$ 0.008 & [km~s$^{-1}$]        \\
$\omega$             & 290       & $\pm$ 5     & 214       & $\pm$ 19    & [deg]                 \\
$K$                  & 124       & $\pm$ 2     & 115       & $\pm$ 26    & [m~s$^{-1}$]         \\
$N_{\rm meas}$       & 22~(E)    & + 14~(S)    & 17~(E)      & + 4~(S)       &                       \\
$\Delta_{\rm S-E}$   & 23        & $\pm$ 4     & 93        & $\pm$ 17    & [m~s$^{-1}$]         \\
$\sigma_{\rm E}$     & 17.5      &             & 12.1      &             & [m~s$^{-1}$]         \\
$\sigma_{\rm S}$     & 9.0       &             & 4.1       &             & [m~s$^{-1}$]         \\
$\sigma_{\rm ES}$    & 10.0      &             & 7.5       &             & [m~s$^{-1}$]         \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
$a_{\rm 1} {\sin i}$ & 4.17      &             & 9.73      &             & [$10^{-4}$ AU]        \\
$f(m)$               & 7.06      &             & 1.30      &             & [$10^{-9}$ $M_\odot$] \\
$m_2 {\sin i}$       & 2.49      &             & 5.61      &             & [$M_{\rm Jup}$]     \\
$a$                  & 0.24      &             & 1.98      &             & [AU]                  \\
\noalign{\smallskip}
\hline
\end{tabular}
$$
\end{table}