\begin{table}%t7
\caption{\label{t7}Orbital systems and comparison with the ephemeris based on the best-fitting orbit(s).}
\small%\centering
\par
\begin{tabular}{lccccccccl}
\hline
\hline 
Identifier & $\rho$$_{\rm obs}$ & $\theta$$_{\rm obs}$ & $\rho$$_{\rm eph}$ & $\theta$$_{\rm eph}$ &  $\delta$$\rho$ & $\delta$$\theta$ & 
$\Delta$Pos & Source   \\\noalign{\smallskip}
\hline
HIP~473    & 6.079  & 178.49 &  6.068   & 182.61 &   0.011 &  --4.120 & 0.437 &  \citet{kiy01} \\ 
HIP~67422  & 3.30   & 170.70 &  3.320   & 173.48 &  --0.020 &  --2.780 & 0.162 &  \citet{he2}   \\ 
HIP~72659  & 6.72   & 314.20 &  6.636   & 317.28 &   0.084 &  --3.080 & 0.369 &  \citet{so99}  \\ 
HIP~79607  & 6.96   & 232.80 &  6.955   & 236.13 &   0.005 &  --3.330 & 0.404 &  \citet{ruy}   \\ 
HIP~88601  & 3.73   & 145.60 &  3.780   & 147.24 &  --0.050 &  --1.640 & 0.119 &  \citet{ruy}   \\ 
HIP~97237  & 1.418  &  46.98 &  0.940   &  82.54 &   0.478 & --35.560 & 0.852 & \citet{he4}    \\
HIP~97237  & 1.418  &  46.98 &  1.521   &  47.44 &  --0.103 &  --0.460 & 0.104 & \citet{so99}   \\
\hline
\end{tabular}
\end{table}