\begin{table}%t2
\caption{\label{table:3}Parameter values for calculation of grain lifetime and the power of their 
dependence on the derived lifetime.}
%\centering
\par
\begin{tabular}{c c c c c c c c}       
\hline\hline\noalign{\smallskip}
$S_{\rm rms}$ \T  &$\kappa_{\rm d}(250)$&$T_{\rm d}$&$A$\tablefootmark{\ast} &$\tau_1$&$v_{\infty}$& $L_4$\\ 
mJy             & $\rm m^2~kg^{-1}$   & K         &$10^{-10}$ & &$\rm km~s^{-1}$&$10^4~L_{\odot}$\\
\hline
\par
9.6  \T         &   0.6517            & 30           &$6.5$     & fit    & 10 & 0.3\\
 1&   --1& --1\tablefootmark{\dagger} & 1        &  1     & 1 & 0.5 \\
\hline                                  
\end{tabular}
\tablefoot{E.g., $t_{\rm g}\propto 1/T_{\rm d}$. \tablefoottext{\ast}{The units of $A$ are 
$M_{\odot}$~yr$^{-1}$/(km~s$^{-1}$). \tablefoottext{\dagger}{In the Rayleigh-Jeans limit; 
which is a bad approximation for $T_{\rm d}\lesssim 20\;\rm K$.}}}
\end{table}