\begin{table}%ta1
\caption{\label{TabFitHCOp}HCO$^{+}$ (0--1) absorption line analysis results.}
%\centerline
{\small
\begin{tabular}{l  c  c  c  c c}
\hline\hline
 \tablefootmark{a}& $\upsilon_0$ & $\Delta \upsilon$ & $\tau_0$ & $N$(HCO$^{+}$) &$N_{\rm H}$ \\
Source      & (\kms) & (\kms) &     & ($10^{12}$ cm$^{-2}$)&($10^{20}$ cm$^{-2}$) \\
\hline
{\bf G05.88-0.39} &  $-4.92$  &1.13 $\pm$ 0.15& 0.09 $\pm$ 0.01 &  0.13 $\pm$  0.03 &  \\
\\[-1mm]
{\bf G08.67-0.36} &   9.82  &0.95 $\pm$ 0.12& 1.60 $\pm$ 0.28 &  2.02 $\pm$  0.58 &  \\
                  &  11.71  &1.40 $\pm$ 0.17& 1.65 $\pm$ 0.28 &  3.08 $\pm$  0.90 &  \\
                  &  14.52  &2.00 $\pm$ 0.18& 1.41 $\pm$ 0.18 &  3.74 $\pm$  0.83 &  \\
                  &  17.76  &1.17 $\pm$ 0.22& 0.87 $\pm$ 0.20 &  1.34 $\pm$  0.56 &  \\
                  &  20.00  &2.55 $\pm$ 0.63& 1.08 $\pm$ 0.16 &  3.65 $\pm$  1.45 &  \\
                  &  22.00  &1.02 $\pm$ 0.58& 0.24 $\pm$ 0.17 &  0.32 $\pm$  0.41 &  \\
\\[-1mm]
{\bf G10.62-0.38} &  11.62  &1.10 $\pm$ 0.12& 0.43 $\pm$ 0.04 &  0.62 $\pm$  0.12 &  \\
                  &  16.38  &2.35 $\pm$ 0.10& 2.23 $\pm$ 0.14 &  6.84 $\pm$  0.74 &  \\
                  &  19.00  &2.13 $\pm$ 0.20& 1.50 $\pm$ 0.09 &  4.18 $\pm$  0.64 &  \\
                  &  22.20  &2.70 $\pm$ 0.27& 1.57 $\pm$ 0.13 &  5.57 $\pm$  1.00 &  \\
                  &  22.95  &1.15 $\pm$ 0.45& 0.82 $\pm$ 0.18 &  1.23 $\pm$  0.75 &  \\
                  &  24.98  &1.65 $\pm$ 0.10& 0.70 $\pm$ 0.06 &  1.51 $\pm$  0.21 &  \\
                  &  27.50  &2.58 $\pm$ 0.17& 1.61 $\pm$ 0.11 &  5.46 $\pm$  0.74 &  \\
                  &  29.00  &1.53 $\pm$ 0.52& 0.78 $\pm$ 0.20 &  1.56 $\pm$  0.93 &  \\
                  &  30.50  &1.52 $\pm$ 0.32& 2.09 $\pm$ 0.27 &  4.13 $\pm$  1.39 &  \\
                  &  40.91  &2.60 $\pm$ 0.10& 2.33 $\pm$ 0.14 &  7.93 $\pm$  0.78 &  \\
                  &  44.94  &1.22 $\pm$ 0.05& 1.30 $\pm$ 0.07 &  2.06 $\pm$  0.21 &  \\
                  &  46.40  &0.60 $\pm$ 0.10& 0.26 $\pm$ 0.04 &  0.20 $\pm$  0.07 &  \\
\\[-1mm]
{\bf G34.3+0.1}   &   9.80  &0.53 $\pm$ 0.22& 0.38 $\pm$ 0.12 &  0.27 $\pm$  0.19 &  \\
                  &  10.60  &0.57 $\pm$ 0.12& 1.86 $\pm$ 0.61 &  1.38 $\pm$  0.72 &  \\
                  &  11.70  &1.37 $\pm$ 0.18& 1.82 $\pm$ 0.39 &  3.34 $\pm$  1.14 &  \\
                  &  14.07  &0.37 $\pm$ 0.08& 0.77 $\pm$ 0.23 &  0.38 $\pm$  0.20 &  \\
                  &  27.00  &1.02 $\pm$ 0.13& 1.19 $\pm$ 0.20 &  1.61 $\pm$  0.47 &  \\
                  &  27.75  &1.83 $\pm$ 0.32& 0.45 $\pm$ 0.09 &  1.10 $\pm$  0.41 &  \\
                  &  48.30  &2.23 $\pm$ 0.20& 0.94 $\pm$ 0.10 &  2.80 $\pm$  0.54 &  \\
\\[-1mm]
{\bf W49N}        &  33.20  &0.65 $\pm$ 0.03& 0.44 $\pm$ 0.02 &  0.34 $\pm$  0.02 & 3.0  \\
                  &  33.70  &2.23 $\pm$ 0.03& 0.63 $\pm$ 0.01 &  1.67 $\pm$  0.02 & 10.5 \\
                  &  36.50  &1.67 $\pm$ 0.12& 0.29 $\pm$ 0.01 &  0.60 $\pm$  0.03 & 7.8  \\
                  &  38.50  &1.75 $\pm$ 0.08& 0.91 $\pm$ 0.01 &  1.88 $\pm$  0.03 & 8.2  \\
                  &  39.70  &1.47 $\pm$ 0.02& 2.01 $\pm$ 0.03 &  3.47 $\pm$  0.05 & 6.9  \\
                  &  50.92  &1.65 $\pm$ 0.10& 0.35 $\pm$ 0.01 &  0.68 $\pm$  0.02 & 7.8  \\
                  &  53.40  &1.23 $\pm$ 0.10& 0.30 $\pm$ 0.02 &  0.43 $\pm$  0.03 & 5.8  \\
                  &  54.00  &3.38 $\pm$ 0.15& 0.51 $\pm$ 0.01 &  2.03 $\pm$  0.04 & 15.9 \\
                  &  56.70  &2.35 $\pm$ 0.07& 0.69 $\pm$ 0.01 &  1.91 $\pm$  0.03 & 11.0 \\
                  &  59.55  &2.35 $\pm$ 0.05& 1.89 $\pm$ 0.02 &  5.24 $\pm$  0.07 & 11.0 \\
                  &  60.80  &0.88 $\pm$ 0.05& 0.77 $\pm$ 0.05 &  0.80 $\pm$  0.06 & 4.1  \\
                  &  62.65  &2.95 $\pm$ 0.03& 1.48 $\pm$ 0.01 &  5.16 $\pm$  0.05 & 13.9 \\
                  &  66.21  &1.85 $\pm$ 0.07& 0.19 $\pm$ 0.01 &  0.41 $\pm$  0.01 & 8.7  \\
                  &  68.58  &1.80 $\pm$ 0.10& 0.24 $\pm$ 0.01 &  0.52 $\pm$  0.01 & 8.5  \\
                  &  71.11  &2.25 $\pm$ 0.20& 0.07 $\pm$ 0.00 &  0.19 $\pm$  0.01 & 10.6 \\
\\[-1mm]
{\bf W51}         &   3.80  &0.47 $\pm$ 0.12& 0.10 $\pm$ 0.02 &  0.06 $\pm$  0.03  & 1.0 \\
                  &   5.10  &1.23 $\pm$ 0.05& 0.72 $\pm$ 0.02 &  1.14 $\pm$  0.08  & 2.7 \\
                  &   6.25  &0.65 $\pm$ 0.03& 1.05 $\pm$ 0.06 &  0.87 $\pm$  0.10  & 1.4 \\
                  &   6.85  &2.01 $\pm$ 0.05& 0.70 $\pm$ 0.02 &  1.80 $\pm$  0.10  & 4.4 \\
                  &  12.71  &1.67 $\pm$ 0.18& 0.10 $\pm$ 0.01 &  0.20 $\pm$  0.04  & 3.7 \\
\hline \noalign{\smallskip}
 \tablefootmark{b}     & $\upsilon_{\rm min}$ & $\upsilon_{\rm max}$ & $\int \tau {\rm d}\upsilon$   &  $N$(HCO$^{+}$) & \\
Source      & (\kms) & (\kms) & (\kms) & ($10^{12}$ cm$^{-2}$) & \\
\hline
{\bf G10.62-0.38} & 13.6 & 15.2 &      0.77 $\pm$  0.08 &      0.94 $\pm$  0.10 & \\
                  & 31.0 & 33.0 &      3.77 $\pm$  0.31 &      4.63 $\pm$  0.38 & \\
                  & 33.3 & 34.7 &      1.81 $\pm$  0.15 &      2.23 $\pm$  0.18 & \\
                  & 34.7 & 36.0 &      1.74 $\pm$  0.16 &      2.13 $\pm$  0.19 & \\
                  & 36.0 & 37.5 &      3.10 $\pm$  0.29 &      3.82 $\pm$  0.36 & \\
                  & 37.5 & 40.0 & $>$6.27         & $>$7.71                & \\
\\
{\bf W49N}        & 41.0 & 47.0 &      0.90 $\pm$  0.03 &      1.00 $\pm$  0.04 & \\
\hline
\end{tabular}}
\tablefoot{\tablefoottext{a}{Multi-Gaussian decomposition. The column densities are derived
  assuming the excitation temperatures given in Table \ref{TabTex}.}
\tablefoottext{b}{Failure of the multi-gaussian decomposition. Column densities
  are inferred from the integral of the opacity assuming the excitation
  temperatures given in Table \ref{TabTex}.}
\tablefoottext{c}{Determined from the average total hydrogen column density per unit velocity
$N_{\rm H}/\Delta v = 2.2$ and 4.7$\times 10^{20}$ cm$^{-2}$/km s$^{-1}$
  toward W51 and W49N respectively.}}
\end{table}