\begin{table}%t1
\caption{\label{tab:fehparams}Parameters $\mu$ and  $\sigma$ describing the Gaussian distribution of [Fe/H],  for different observation samples.}
\par
%%\centering

\small
\begin{tabular}{lcc}
\hline\hline
Source& $\mu$   & $\sigma $\\ 
\hline
Nordstr\"om et~al. (\cite{nordstrom2004})& $-$0.14 &  0.19 \\
CORALIE planet search sample & $-$0.02 & 0.22  \\
Fischer \& Valenti (\cite{fischervalenti2005}) planet search sample &0.05& 0.21\\
Fischer \& Valenti (\cite{fischervalenti2005}) volume limited subsample &$-$0.05& 0.26\\
\hline
\end{tabular}
\end{table}