\begin{table}%t1
\caption{\label{param}Physical properties of NGC~6611 and M~16 obtained in GPM07, GDM08, and GMP10.}
%\centering
\par
\begin{tabular}{cc}
\hline
\hline \noalign{\smallskip}
Parameter& Value \\
\hline
Distance  & 1750 parsec\\
Median age of NGC~6611 & ${\sim}1$ Myr\\
Age range of stars in M~16 & ${\sim}3{-}0.3$ Myr \\
Average DF\tablefootmark{*} in NGC~6611	& $36\% \pm 1 \%$ \\
Average DF\tablefootmark{*} far away from OB stars &  $42\% \pm 3 \%$ \\
Average DF\tablefootmark{*} close to OB stars & $28\% \pm 3 \%$ \\
Average $A_V$ in NGC~6611 & 2.6$^m$   \\
$R_V$ & 3.3   \\
Core relaxation time & 5.2 Myr\\
\hline
\end{tabular}
\tablefoot {\tablefoottext{*}{DF stands for Disk Frequency.}}
\end{table}