\begin{table}%t4
\caption{Neptunian hosts and their metal content. We also list the mass (in earth masses) of the least massive planet orbiting the star, as well as an indication of whether there is one or more jovian companions.}\label{tab4}
%\centering
\small
\begin{tabular}{lrccl}
\hline
\hline
Star & [Fe/H] & jov.? & $M_{\rm p}\sin i$ & [Fe/H] reference\\
\hline
\object{Gl 581 }   & --0.33 &  no &   5.09 & \citet[][]{Bean-2006}\\
                   & --0.25  &     &        & \citet[][]{Bonfils-2005b}\\
                   & --0.29  &     &        & Mean value\\
\object{Gl 876 }   & --0.12 & yes &   5.72 & \citet[][]{Bean-2006}\\
                   & --0.03  &     &        & \citet[][]{Bonfils-2005b}\\
                   & --0.08  &     &        & Mean value\\
\object{HD69830}   & --0.06 &  no & 10.49  & This work\\
\object{HD160691}  &  0.30 & yes & 13.99  & This work\\
\object{Gl 674 }   & --0.28 &  no & 11.76  & \citet[][]{Bonfils-2007}\\
\object{55 Cnc e}  &  0.33 & yes & 10.81  & \citet[][]{Santos-2004b}\\
\object{HD4308}    & --0.34 &  no & 14.94  & This work\\
\object{HD190360}  &  0.24 & yes & 18.12  & \citet[][]{Santos-2004b}\\
\object{HD219828}  &  0.19 & yes & 20.98  & \citet[][]{Melo-2007}\\
\object{GJ 436}    & --0.32 &  no & 22.89  & \citet[][]{Bean-2006}\\
                   &  0.02 &     &        & \citet[][]{Bonfils-2005b}\\
                   & --0.15 &     &        & Mean value\\
\object{Gl 176}    & --0.10 &  no & 24.16  & \citet[][]{Endl-2007}\\
\hline
\end{tabular}
\end{table}