\begin{table}%tA.8
\caption{\label{trat}HCO$^{+}$(1--0) to HCN(1--0) line ratios\tablefootmark{\ast}.}
\par
%\centering
\par
\begin{tabular}{lccc}
\hline \hline \noalign{\smallskip}
Source & Area HCO$^{+}$(1--0) & Area HCN(1--0) & Ratio\\
 & (K~km~s$^{-1}$) & (K~km~s$^{-1}$) & \\
\hline
05358+3543 & 46.6 (0.1) & 42.4 (0.2) & 1.10 (0.005)\\
G213.61$-$12.6 & 21.9 (0.5) & 41.9 (0.7) & 0.52 (0.016)\\
G189.78+0.34 & 36.3 (0.5) & 45.8 (0.7) & 0.79 (0.017)\\
G192.58$-$0.04 & 31.6 (0.1) & 55.8 (0.1) & 0.57 (0.002)\\
G192.60$-$0.05 & 28.5 (0.1) & 73.2 (0.1) & 0.39 (0.001)\\
18151$-$1208\_2 & 38.5 (0.1) & 56.8 (0.2) & 0.68 (0.003)\\
18151$-$1208\_3 & 14.2 (0.1) & 20.6 (0.1) & 0.69 (0.006)\\
18151$-$1208\_1 & 35.1 (0.1) & 47.8 (0.2) & 0.73 (0.004)\\
G18.15$-$0.28 & 23.0 (0.5) & 35.1 (0.8) & 0.65 (0.020)\\
G18.18$-$0.30 & 17.0 (0.2) & 21.8 (0.3) & 0.78 (0.015)\\
18223$-$1243 & 16.5 (0.2) & 27.7 (0.3) & 0.59 (0.010)\\
18228$-$1312 & 26.2 (0.2) & 31.9 (0.3) & 0.82 (0.010)\\
G19.27+0.1M2 & 2.1 (0.1) & 7.4 (0.2) & 0.29 (0.017)\\
G19.27+0.1M1 & 2.9 (0.3) & 4.9 (1.0) & 0.59 (0.140)\\
18236$-$1205 & 9.6 (0.2) & 12.1 (0.3) & 0.80 (0.028)\\
18264$-$1152 & 65.4 (0.1) & 80.6 (0.2) & 0.81 (0.002)\\
G23.60+0.0M1 & 21.1 (0.1) & 34.4 (0.2) & 0.61 (0.004)\\
18316$-$0602 & 40.6 (0.3) & 62.5 (0.4) & 0.65 (0.006)\\
G23.60+0.0M2 & 2.6 (0.1) & 14.8 (0.2) & 0.18 (0.005)\\
18317$-$0513 & 22.2 (0.3) & 33.5 (0.6) & 0.66 (0.016)\\
G24.08+0.0M2 & 3.9 (0.1) & 3.7 (0.2) & 1.06 (0.053)\\
G24.33+0.1M1 & 4.3 (0.1) & 1.0 (0.1) & 4.3 (0.484)\\
G24.33+0.1M4 & 3.9 (0.4) & 3.7 (0.5) & 1.05 (0.186)\\
G24.33+0.1M2 & 9.8 (0.5) & 7.3 (0.7) & 1.35 (0.148)\\
G24.60+0.1M2 & 6.6 (0.1) & 3.2 (0.1) & 2.06 (0.082)\\
G24.60+0.1M1 & 11.3 (0.2) & 13.9 (0.2) & 0.81 (0.019)\\
G25.04$-$0.2M1 & 10.6 (0.1) & 5.6 (0.2) & 1.90 (0.080)\\
G25.04$-$0.2M4 & 6.1 (0.1) & 1.9 (0.2) & 3.15 (0.298)\\
G25.04$-$0.2M2 & 7.4 (0.2) & 3.3 (0.2) & 2.23 (0.161)\\
G28.28$-$0.35 & 9.7 (0.5) & 19.1 (0.9) & 0.51 (0.037)\\
18507+0121 & 15.7 (0.6) & 32.5 (1.3) & 0.48 (0.027)\\
G34.43+0.2M1 & 17.2 (0.1) & 51.1 (0.2) & 0.34 (0.003)\\
G34.43+0.2M3 & 18.9 (0.1) & 37.8 (0.2) & 0.50 (0.004)\\
G34.24+0.13 & 9.8 (0.1) & 19.7 (0.2) & 0.50 (0.008)\\
18517+0437 &45.6 (0.2) & 48.6 (0.2) & 0.94 (0.005)\\
G34.77$-$0.6M2 & 4.2 (0.4) & 2.2 (0.6) & 1.92 (0.535)\\
G35.39$-$0.3M4 & 11.6 (0.4) & 9.0 (0.6) & 1.29 (0.099)\\
G38.95$-$0.5M1 & 9.7 (0.2) & 11.5 (0.2) & 0.85 (0.022)\\
19035+0641 & 16.1 (0.2) & 18.4 (0.2) & 0.88 (0.017)\\
19095+0930 & 39.1 (0.2) & 40.1 (0.3) & 0.98 (0.009)\\
20216+4107 & 15.5 (0.1) & 15.1 (0.1) & 1.02 (0.010)\\
20332+4124 & 9.2 (0.1) & 10.2 (0.1) & 0.90 (0.014)\\
22134+5834 & 8.6 (0.1) & 14.4 (0.2) & 0.60 (0.008)\\
22570+5912\_2 & 13.3 (0.4) & 12.0 (0.7) & 1.11 (0.075)\\
22570+5912\_1 & 10.8 (0.1) & 11.7 (0.1) & 0.92 (0.011)\\
23033+5951 & 40.7 (0.1) & 36.7 (0.1) & 1.11 (0.005)\\
23139+5939 & 24.6 (0.5) & 28.3 (0.7) & 0.87 (0.028)\\
23151+5912 & 5.6 (0.1) & 15.5 (0.1) & 0.36 (0.005)\\
\hline
\end{tabular}
\tablefoot {\tablefoottext{\ast}{The errors are indicated in brackets.}}
\end{table}