\begin{table}%t3
\caption{\label{T3}Orbital parameters for the planets orbiting {GJ}~876, obtained with a 4-body Newtonian fit to all available radial velocity observational data (Lick, Keck, CORALIE, ELODIE, and HARPS).}
%\centering
 \begin{tabular}{l l c c c}
\hline \hline \noalign{\smallskip}
Param.  &  [Unit] & $b$ & $c$ & $d$\\
\hline \noalign{\smallskip}
Date & [JD]   & \multicolumn{3}{c}{2~455~000.00 (fixed)}  \\ 
$V_{\rm Lick}$ &[km~s$^{-1}$] & \multicolumn{3}{c}{$-0.0304 \pm 0.0058 $}  \\ 
$V_{\rm Keck}$ & [km~s$^{-1}$] & \multicolumn{3}{c}{$\phantom{-}0.0131 \pm 0.0058 $}  \\ 
$V_{\rm CORALIE}$&[km~s$^{-1}$]&\multicolumn{3}{c}{$-1.8990 \pm 0.0061 $}  \\ 
$V_{\rm ELODIE}$ &[km~s$^{-1}$]&\multicolumn{3}{c}{$-1.8624 \pm 0.0064 $}  \\ 
$V_{\rm HARPS}$&[km~s$^{-1}$] & \multicolumn{3}{c}{$-1.3389 \pm 0.0058 $}  \\
\hline  
$P$          & [day]                & $ 61.065 \pm 0.012 $ & $ 30.259 \pm 0.010 $ & $ 1.93785 \pm 0.00002  $ \\ 
$\lambda$    & [deg]                & $ 35.56  \pm 0.15  $ & $ 159.05 \pm 0.76  $ & $   29.37 \pm 3.21  $ \\ 
$e$          &                      & $  0.031 \pm 0.001 $ & $  0.265 \pm 0.002 $ & $   0.124 \pm 0.032 $ \\ 
$\omega$     & [deg]                & $ 274.69 \pm 2.57  $ & $ 274.64 \pm 1.19  $ & $  168.45 \pm 17.21 $ \\ 
$K$          & [m~s$^{-1}$]                & $ 212.09 \pm 0.33  $ & $  85.91 \pm 0.40  $ & $    6.60 \pm 0.26  $ \\  
$i$          & [deg]                & $ 48.98 \pm 0.94 $    & $  45.67 \pm 1.81 $ & $ 50 $ (fixed)	 \\  
$\Omega$     & [deg]                & $ 0 $ (fixed)         & $  -1.67 \pm 0.84 $ & $  0 $ (fixed) \\ 
\hline \noalign{\smallskip}
$a_1 \sin i$ & [$10^{-3}$~AU]       & $ 1.19  $           & $ 0.23  $ 	  & $ 1.2 \times 10^{-3} $ \\
$f (M)$ & [$10^{-9}~M_\odot$]& $60.27  $           & $ 1.78  $ 	  & $ 5.6 \times 10^{-5} $ \\
$M \sin i$ & [$M_\oplus$] & $ - $               & $ - $ 	  & $ 6.2 $ \\
$M$        & [$M_\mathsf{\rm Jup}$]     & $ 2.64  $           & $ 0.86  $ 	  & $ - $ \\
$a$          & [AU] & $ 0.211 $           & $ 0.132 $ 	  & $ 0.021 $ \\
\hline
$N_{\rm meas}$        &          & \multicolumn{3}{c}{309}   \\
Span & [day]                & \multicolumn{3}{c}{5025}   \\
$\sqrt{\chi^2}$     &  & \multicolumn{3}{c}{1.46}   \\ 
${\rm rms}$  & [m~s$^{-1}$]                & \multicolumn{3}{c}{3.01}   \\
\hline
\end{tabular}
\tablefoot{Errors are given by the standard deviation $\sigma$, and $\lambda$ is the mean longitude of the date.} 
\end{table}