\begin{table}%t4
\caption{\label{tab4}Derived properties.}
\small%\centerline
{
\begin{tabular}{l l l l c c c c c c c }
\hline\hline
       &                &               &               &
                    &                & \multicolumn{2}{c} {30~K} &&\multicolumn{2}{c} {60~K}  \\
\cline{7-8} \cline{10-11}     
Source &  $V_{\rm sys}$ & $d_{\rm near}$& $d_{\rm far}$ &
$N$(H$^{13}$CO$^+$) & $N$(C$^{18}$O) & log$n_{\rm H_2}$ & log$N$(CS) &&  log$n_{\rm H_2}$ & log$N$(CS) \\
       & (km~s$^{-1}$) &  (kpc)     &    (kpc)    & 
       (10$^{12}$cm$^{-2}$) & (10$^{15}$cm$^{-2}$)
       &(cm$^{-3}$)   &  (cm$^{-2}$) &&(cm$^{-3}$)   &  (cm$^{-2}$)    \\
\hline
21.407$-$0.254 & 90.7  & 6.0  & 10.4 &--   &  3.8  &--  &--  &&-- &-- \\
22.335$-$0.155 & 30.9  & 2.4  & 14.7 & 2.1 &  3.7  &6.15~$\pm$~0.15 &  14.52~$\pm$~0.10 && 5.91~$\pm$~0.12 & 14.68~$\pm$~0.06 \\
22.357$+$0.066 & 84.2  & 5.2  & 10.6 & 2.2 & 19.1  &5.48~$\pm$~0.09 &  14.70~$\pm$~0.11 &&5.27~$\pm$~0.13 & 14.52~$\pm$~0.21 \\
23.707$-$0.198 & 68.9  & 5.1  & 10.5 & 3.2 & 13.2  &5.93~$\pm$~0.08 &  13.74~$\pm$~0.14 &&5.57~$\pm$~0.08 & 13.49~$\pm$~0.07 \\
23.966$-$0.109 & 72.7  & 4.2  & 11.6 & 5.1 &  9.0  &$>$6.7  &  14.73~$\pm$~0.57 && $>$6.5  & 15.16~$\pm$~0.52 \\
24.147$-$0.009 & 23.1  & 2.0  & 14.5 & 1.4 &  2.1  &5.61~$\pm$~0.08  & 14.51~$\pm$~0.18 && 5.42~$\pm$~0.12 & 14.60~$\pm$~0.56 \\ 
24.541$+$0.312 & 107.8 & 7.0  &  9.5 & 1.5 &  4.6  &--  &-- &&-- &-- \\
24.635$-$0.323 & 42.7  & 3.7  & 13.1 & 4.7 &  7.6  &$>$6.7   & 14.61~$\pm$~0.38 && 6.39~$\pm$~0.12  & 14.53~$\pm$~0.23 \\ 
25.410$+$0.105 & 96.0  & --    &  9.5 & 3.4 &  7.0  &6.42~$\pm$~0.11 & 14.40~$\pm$~0.08 && 6.22~$\pm$~0.07  & 14.53~$\pm$~0.20 \\
26.598$-$0.024 & 23.3  & 1.8  & 13.4 & 1.8 & 32.6  &$>$6.9   & 14.54~$\pm$~0.42 && $>$6.5   & 14.86~$\pm$~0.28 \\
27.221$+$0.136 & 112.6 & --    &  8.0 &--    &  9.4  &--  &-- &&-- &-- \\
28.817$+$0.365 & 87.0  & 5.5  &  9.4 &--    &  5.3  &--  &-- &&-- &-- \\
30.316$+$0.069 & 45.3  & 2.8  & 12.2 & 2.2 &  3.3  &$>$6.9   & 14.77~$\pm$~0.18&& 6.28~$\pm$~0.19  & 14.59~$\pm$~0.09 \\
30.398$-$0.297 & 102.4 & 6.0  &  8.5 & 1.6 &  3.7  &6.12~$\pm$~0.10  &  14.83~$\pm$~0.08 &&-- &-- \\
31.056$+$0.361 & 77.6  & --    &  9.6 &--    &  2.9  &--  &-- &&-- &-- \\
31.156$+$0.045 & 38.9  & 2.7  & 11.9 & 2.2 &  4.8  &6.06~$\pm$~0.04  &
       14.11~$\pm$~0.06 && 5.74~$\pm$~0.06  & 14.64~$\pm$~0.13 \\
31.585$+$0.080 & 96.0  & 5.4  &  8.1 &--    & 11.8  &--  &-- &&-- &-- \\
32.966$+$0.041 & 83.4  & 5.4  &  8.9 & 1.3 &  4.2  &--  &-- &&4.39~$\pm$~0.11  & 15.73~$\pm$~0.16 \\
33.648$-$0.224 & 61.5  & --    & 10.4 &--    &  2.1  &--  &-- &&-- &-- \\
33.980$-$0.019 & 61.1  & 3.5  & 10.6 & 2.5 &  4.7  &--  &-- &&4.52~$\pm$~0.21  & 15.76~$\pm$~0.13  \\
34.753$-$0.092 & 51.1  & 3.1  & 11.0 &-    &  1.4  &--  &-- &&-- &--- \\
35.791$-$0.175 & 61.9  & 4.6  & 10.3 & 2.4 &  3.0  &--  &-- &&-- &- \\
36.115$+$0.552 & 76.0  & 4.9  &  9.0 & 1.9 &  8.1  &--  &-- &&$>$6.8$^{90}$& 15.60~$\pm$~0.19$^{90}$ \\
36.704$+$0.096 & 59.8  & 4.6  & 10.4 &--    &  0.9  &--  &-- &&-- &-- \\
37.030$-$0.039 & 80.1  & 5.0  &  8.3 &--    &--      &--  &-- &&-- &-- \\
37.479$-$0.105 & 59.1  & --    &  9.5 &--    &--      &--  &-- &&-- &-- \\
37.600$+$0.426 & 90.0  & 6.5  &  7.5 &--    &--      &--  &-- &&-- &-- \\
39.100$+$0.491 & 23.1  & 1.0  & 14.7 & 2.0 &  2.9  &--  &-- && 6.58~$\pm$~0.08$^{90}$ & 14.81~$\pm$~0.08$^{90}$ \\
\hline
\end{tabular}}
\smallskip
$^{90}$ Values for kinetic temperature 90~K.
\end{table}