\begin{table}%t6
\caption{\label{dcop_result}Rotational analysis for HCO$^+$ and isotopologues. Upper limits are 3$\sigma$. }
\small%\centerline
{
\begin{tabular}{lcccccc} 
\hline
\hline 
                        & \multicolumn{3}{c}{clump~1}   &  \multicolumn{3}{c}{clump~3} \\
$T_{\rm rot}$ &    $N_{\rm DCO^+}$  & $N_{\rm H^{13}CO^+}$ &  $N_{\rm DCO^+}$/$N_{\rm HCO^+}$$^1$ & $N_{\rm DCO^+}$  & $N_{\rm H^{13}CO^+}$ &  $N_{\rm DCO^+}$/$N_{\rm HCO^+}$$^1$  \\
           &    \small{(cm$^{-2}$)}  & \small{(cm$^{-2}$)}  & &  \small{(cm$^{-2}$)}  & \small{(cm$^{-2}$)}  & \\ 
\hline
\noalign{\smallskip}
20 K  &  $<$1.6~$\times$~10$^{11}$ & 1.0~$\times$~10$^{13}$ & $<$2.3~$\times$~10$^{-4}$ & (5.0~$\pm$~0.8)~$\times$~10$^{11}$ & (9.9~$\pm$~0.1)~$\times$~10$^{12}$ & (7.3~$\pm$~1.4)~$\times$~10$^{-4}$ \\
30 K  & $<$2.0~$\times$~10$^{11}$ &  1.4~$\times$~10$^{13}$  & $<$2.0~$\times$~10$^{-4}$ & (6.2~$\pm$~1.0)~$\times$~10$^{11}$ & (1.4~$\pm$~0.2)~$\times$~10$^{13}$ & (6.4~$\pm$~1.3)~$\times$~10$^{-4}$ \\
40 K  & $<$2.4~$\times$~10$^{11}$ & 1.8~$\times$~10$^{13}$  & $<$1.9~$\times$~10$^{-4}$ &  (7.5~$\pm$~1.2)~$\times$~10$^{11}$ & (1.8~$\pm$~0.2)~$\times$~10$^{13}$ & (6.0~$\pm$~1.1)~$\times$~10$^{-4}$ \\
50 K  &$<$2.8~$\times$~10$^{11}$ & 2.2~$\times$~10$^{13}$  & $<$1.8~$\times$~10$^{-4}$ &  (8.9~$\pm$~1.4)~$\times$~10$^{11}$ & (2.2~$\pm$~0.2)~$\times$~10$^{13}$ & (5.9~$\pm$~1.0)~$\times$~10$^{-4}$ \\
70 K  & $<$3.7~$\times$~10$^{11}$ &  3.1~$\times$~10$^{13}$  & $<$1.7~$\times$~10$^{-4}$ & (1.2~$\pm$~0.2)~$\times$~10$^{12}$ & (3.0~$\pm$~0.3)~$\times$~10$^{13}$ & (5.7~$\pm$~1.1)~$\times$~10$^{-4}$  \\ 
\hline
\end{tabular}}
\smallskip
$^1$ We assume HCO$^+$/H$^{13}$CO$^+$~=~70 \citep{Wilson99}.
\end{table}