\begin{table}%T1
\caption{\label{tab:model_details}Shell parameters of R~Scl and~U~Cam.} 
    %\centering
\par
  \begin{tabular}{@{\ }l l l@{\ }l l@{\ } l l l@{\ } l l@{\ }}
    \hline
    \hline\noalign{\smallskip}
    & 
    &
    \multicolumn{5}{c}{Gas shell$^a$}&
    &
    \multicolumn{2}{c}{Dust shell}
    \\
    \cline{3-7}
    \cline{9-10}
    \\
    Source& 
    d& 
    $R_{\rm in}$&
    $R_{\rm out}$& 
    $R_{\rm in}$&
    $R_{\rm out}$& 
    $\dot{M}$&
    &
    $\dot{M}_{\rm dust}$& 
    MgS
    \\
    &
    [pc]&
    \multicolumn{2}{c}{[$^{\prime\prime}$]}& 
    \multicolumn{2}{c}{[10$^{16}$~cm]}& 
    \multicolumn{3}{c}{[$M_\odot$/yr]}&
    \%
    \\
   \noalign{\smallskip} \hline\noalign{\smallskip}
    R Scl & 360 & 13 & 26 & 7 & 14  &$ 4\times 10^{-6}$ &&$ 8\times 10^{-9}$ & 4 \\
    U Cam$^b$ & 500 & 7 & 9 & 5.5 & 6.6 & $9\times 10^{-6}$ &&$ 1.6\times 10^{-8}$ & 4 \\
   \noalign{\smallskip} \hline
  \multicolumn{10}{l}{$^a$Taken from
    \citet{2001AetA...368..969S}.}
\\
\multicolumn{10}{l}{$^b$The dust parameters for U~Cam
    only concern
 the dust located}\\
\multicolumn{10}{l}{inside the SWS aperture (see text
    for details).}  
\end{tabular}
\end{table}