\begin{table}%t1
\caption{\label{table:initorb}Parameters of the model systems considered.}
%\centerline
 {
\begin{tabular}{ r | c c c c c }       
\hline                 
\hline                 
Planet & $m$ (${M}_{\rm J}$) & $a$ (AU) & $P$ (days)  &$e$ & $ \zeta$  \\   
\hline\\[-3.2mm]   % M_\odot = 0              
GJ~876$^1$ c & 0.790 & 0.131 &30.46& 0.263 & $10\degree $ \\ %& $284\degree$\\ %P=0.523902 
       b & 2.530 & 0.208 &60.83& 0.031 &  \\% &  f=2.88827 %P=1.05136 
\hline \\[-3.2mm]    % M_\odot = 0.80              
GJ~876 LM$^2$ c & 0.13 & 0.131 &30.46& 0.263 & $10\degree $ \\ %& $284\degree$\\ %P=0.523902 
       b & 0.42 & 0.208 &60.83& 0.031 &  \\% &  f=2.88827 %P=1.05136 
\hline\\[-3.2mm]     % M_\odot = 0.80              
GJ~876 SE$^3$ c & 0.013 & 0.131 &30.46& 0.263 & $10\degree $ \\ %& $284\degree$\\ %P=0.523902 
       b & 0.042 & 0.208 &60.83& 0.031 &  \\% &  f=2.88827 %P=1.05136 
\hline\\[-3.2mm]     % M_\odot = 0.80              
GJ~876 E$^4$ c & 0.0013 & 0.0131 &30.46& 0.263 & $10\degree $ \\ %& $284\degree$\\ %P=0.523902 
       b & 0.0042 & 0.208 &60.83& 0.031 &  \\% &  f=2.88827 %P=1.05136 
\hline\\[-3.2mm]     % M_\odot = 0.80              
GJ~876 LM HE$^5$ c & 0.13 & 0.131 &30.46& 0.41 & $10\degree $ \\ %& $284\degree$\\ %P=0.523902 
       b & 0.42 & 0.208 &60.83& 0.09 &  \\% &  f=2.88827 %P=1.05136 
\hline\\[-3.2mm]     % M_\odot = 0.80              
GJ~876 SE HE$^6$ c & 0.013 & 0.131 &30.46& 0.41 & $10\degree $ \\ %& $284\degree$\\ %P=0.523902 
       b & 0.042 & 0.208 &60.83& 0.09 &  \\% &  f=2.88827 %P=1.05136 
\hline\\[-3.2mm]     % M_\odot = 0.80
HD~128311$^7$ b & 1.56 & 1.109 & 476.8 & 0.38 & $58 \degree$ \\
         c & 3.08 & 1.735 & 933.1 & 0.21 & \\
\hline
\end{tabular}}
\par
\medskip
$^1$ {Orbital elements of the system \object{GJ~876} \citep[][orbital inclination $i=50\degree$]{Rivera2005}.}\\
$^2$ {Planet masses scaled down by a factor of 6. Equivalent to a Jovian mass planet around a solar mass star.}\\
$^3$ {Planet masses scaled down by a factor of 60. Equivalent to a super-Earth around a solar mass star.} \\
$^4$ {Planet masses scaled down by a factor of 600. Equivalent to an Earth mass planet around a solar mass star.}\\
$^5$ {Planet masses scaled down by a factor of 6 (Jovian mass planet) and higher eccentricities than in the observed system.}\\
$^6$ {Planet masses scaled down by a factor of 60 (super-Earth) and higher eccentricities than in the observed system.}\\
$^7$ {Orbital elements of the system \object{HD~128311} \citep{Vogt2005}.}
\end{table}