\begin{table}%t4
\par
%\centering
\par
\caption{\label{tab_dfrac}Physical parameters derived in Paper~I for
condensations N and S from \H\ and \D .} 
\begin{tabular}{cccccc}
\hline \hline
Source & $N({\rm N_2H^+})$ & $N({\rm N_2D^+})$ & $D_{\rm frac}$ & $L$ & $M_{\rm N_2H^+}$ \\
       & ($\times 10^{13}$~\cmq )  & ($\times 10^{12}$~\cmq )  & & (pc) & ($M_{\odot}$) \\
\hline
N    &  1.9(0.6) &  2.1(0.3) &    0.11(0.04) & 0.09 & 8.7 \\
S  &   1.5(0.5) &  1.6(0.3)  &    0.11(0.04) & 0.05 & 2.5 \\
\hline
\end{tabular}
\end{table}