\begin{table}%t1
\caption{\label{charcs}Characteristics of the stars used in this paper.}
%\centering
 \small \begin{tabular}{lccc}
\hline \hline\noalign{\smallskip}
Star name & Distance & Mass loss rate  & Ref.  \\ 
                   &  (pc)    & ($M_{\odot}$~yr$^{-1}$)  & \\
\hline\noalign{\smallskip}
\object{VY CMa}             & 1100     & 0.5--$1 \times 10^{-4}$         & (1), (2)\\
\object{IK Tau}             & 300      & $4.9 \times 10^{-6}$            & (3)\\     
\object{TX Cam}             & 390      & $2.6 \times10^{-6}$            & (3)\\
\object{RX Boo}             & 160      & $2.2 \times10^{-7}$            & (4)\\
\object{IRC+10011} (\object{WX Psc}) & 830      & $6 \times10^{-6}$              & (5)\\
\object{R Cas}              & 107      & $3.4 \times 10^{-7}$ & (6)\\
\hline
\end{tabular}
\tablefoot{(1) Reid \& Menten (in preparation); \citet{choi}; (2) \citet{decin}; (3) \citet{olivier}; (4) \citet{teyssierAgb}; (5) \citet{decinWXPsc}; (6) \citet{truongbach}.}
\end{table}