\begin{table}%t2
%\centering
\par
\caption{Blister model properties for S125.\label{tab2}}
$$
\begin{array}{p{0.5\linewidth}l}
%  \begin{array}{lc}
\hline\hline
\noalign{\smallskip}
 Density at ionizing star & 60 \hspace{1mm}\rm{cm}^{-3} \\
 Density scale height & 0.65 \hspace{1mm}\rm{pc} \\
 Blister opening angle & 70 ^{\circ} \\
 Radius of evacuated region  & 0.3 \hspace{1mm}\rm{pc} \\
 Distance to Ionization Front$^{{\rm a}}$ &  0.8 \hspace{1mm}\rm{pc} \\
 Distance to PDR region$^{{\rm a}}$ & 2.7 \hspace{1mm}\rm{pc} \\
 Visual Extinction$^{{\rm ab}}$ & 4.5 \hspace{1mm}\rm{mag} \\
 Emission measure$^{{\rm a}}$ &  8200 \hspace{1mm}\rm{cm}^{-6}\hspace{1mm}\rm{pc} \\
 H  column density$^{{\rm a}}$ &  1.2\times 10^{21} \hspace{1mm}\rm{cm}^{-2} \\
 H$_{2}$ column density$^{{\rm ab}}$ &  4.\times 10^{21} \hspace{1mm}\rm{cm}^{-2} \\
 Dust/H mass ratio (HII~region)  & 0.75\times 10^{-6} \\
 Dust/H mass ratio (PDR region)  & 0.83\times 10^{-2} \\ 
 Mass of HII  &  22.5 \hspace{1mm}{M} _{\odot} \\
 Mass of HI  &  893 \hspace{1mm}{M}_{\odot} \\
 Mass of H$_{2}^{{\rm b}}$ &  1.7\times 10^{4} \hspace{1mm}{M}_{\odot} \\
 Stellar luminosity  & 4\times 10^{4} \hspace{1mm}{L}_{\odot} \\
 Total FIR luminosity $^{{\rm b}}$ & 2\times 10^{4} \hspace{1mm}{L}_{\odot} \\
 HII~region FIR luminosity &  551  \hspace{1mm}{L}_{\odot} \\
\noalign{\smallskip}
\hline
\end{array}
$$
\begin{list}{}{}
\item[$^{{\rm a}}$] From the ionizing star along the symmetry axis ($\theta = 180^{\circ}$).
\item[$^{{\rm b}}$] To the limits of the calculation.
\par
\end{list}
\par
\end{table}