\begin{table}
  %\centering
\par
  \caption {\label{tab:l310}As Table~\ref{tab:ophd} but for lines observed towards
    L~310. The dust and thus \hh\ column densities are only the
    3$\sigma$ level.}
 {\tiny \begin{tabular}{l r r r r r c c r}\hline\hline\noalign{\smallskip}
    Line & $\delta x$ & $\delta y$ & $T_{\rm mb}$ & $W$ & \dveq & $N_{\rm tot}$ & $N(\hh)$ & $N_{\rm tot}/2N(\hh)$ \\
    & \arcsec & \arcsec & mK & m\kkms & \kms & \dix{12}~\cc & \dix{22}~\cc \smallskip\\\hline
    %
    % L~310
    CN%-l310.tdv % l310-cn_final.cdens
    & 30 & 80 & 390 $\pm$ 60& 230 $\pm$ 20& 0.5 & 67 & 1.5 & $4.5(-9)$\\
    & 10 & 60 & $<$305 & $<$120 & & $<$35.2 &$<$0.7 & \\
    & 10 & 80 & $<$303 & $<$130 & & $<$38.1 &$<$0.7 & \\
    & 30 & 40 & $<$288 & $<$110 & & $<$32.2 &$<$0.7 & \\
    & 30 & 60 & 300 $\pm$ 55& 110 $\pm$ 15& 0.3 & 32 $\pm$ 4.4 & 1.5 & $2.1(-9)$ \\
    & 50 & 60 & $<$280 & $<$110 & & $<$32.2 &$<$0.7 & \\
    HCN%-l310.tdv % l310-hcn_final.cdens
    & 30 & 80 & 615 $\pm$ 35& 370 $\pm$ 10& 0.60 & 6.1 & 1.5 & $4.1(-10)$ \\
    & 10 & 60 & 300 $\pm$ 55& 230 $\pm$ 20& 0.77 & 3.8 &$<$0.7 & \\
    & 10 & 80 & 290 $\pm$ 60& 155 $\pm$ 20& 0.53 & 2.5 $\pm$ 0 .33 &$<$0.7 & \\
    & 30 & 40 & 150 $\pm$ 50& $<$70& & $<$1.15 &$<$0.7 & \\
    & 30 & 60 & 525 $\pm$ 35& 300 $\pm$ 15& 0.57 & 4.9 & 1.5 & $3.3(-10)$ \\
    & 50 & 60 & 280 $\pm$ 55& 150 $\pm$ 25& 0.54 & 2.5 $\pm$ 0.41 &$<$0.7 & \\
    H\thcn%-l310.tdv % l310-h13cn_final.cdens
    & 30 & 80 & 160 $\pm$ 20& 101 $\pm$ 7& 0.63 & 0.34 & 1.5 & $2.3(-11)$ \\
    & --10 & 80 & $<$90 & $<$36& & $<$0.12 &$<$0.7 & \\
    & 10 & 80 & $<$90 & $<$36& & $<$0.12 &$<$0.7 & \\
    & 30 & 40 & $<$105 & $<$42& & $<$0.14 &$<$0.7 & \\
    & 30 & 60 & 150 $\pm$ 30& 70 $\pm$ 11& 0.47 & 0.24 $\pm$ 0.04 & 1.5 & $1.6(-11)$ \\
    & 30 & 100 & $<$95 & $<$40& & $<$0.14 &$<$0.7 & \\
    & 30 & 120 & $<$95 & $<$40& & $<$0.14 &$<$0.7 & \\
    & 50 & 60 & $<$135 & $<$55& & $<$0.19 &$<$0.7 & \\
    & 50 & 80 & 165 $\pm$ 35& 65 $\pm$ 8& 0.39 & 0.22 $\pm$ 0.03 & 1.3 & $1.7(-11)$ \\
    & 50 & 100 & $<$140 & $<$60& & $<$0.20 & 1.5 & $<$$1.6(-11)$ \\
    & 70 & 80 & $<$90 & $<$40& & $<$0.14 &$<$0.7 & \\
    HN\thc%-l310.tdv % l310-hn13c_fin al.cdens
    & 30 & 80 & 405 $\pm$ 25& 320 $\pm$ 10& 0.79 & 0.55 & 1.5 & $3.7(-11)$ \\
    & --10 & 80 & $<$125 & $<$55& & $<$0.10 &$<$0.7 & \\
    & 10 & 80 & 205 $\pm$ 45& 100 $\pm$ 15& 0.49 & 0.17 $\pm$ 0.03 &$<$0.7 & \\
    & 30 & 40 & $<$120 & $<$50& & $<$0.09 &$<$0.7 & \\
    & 30 & 60 & 390 $\pm$ 40& 200 $\pm$ 10& 0.51 & 0.35 & 1.5 & $2.3(-11)$ \\
    & 30 & 100 & 150 $\pm$ 40& 70 $\pm$ 15& 0.47 & 0.12 $\pm$0.03 &$<$0.7 & \\
    & 30 & 120 & $<$120 & $<$52& & $<$0.09 &$<$0.7 & \\
    & 50 & 60 & 230 $\pm$ 60& $<$75& & $<$0.13 &$<$0.7 & \\
    & 50 & 80 & 465 $\pm$ 40& $<$54& & $<$0.09 & 1.3 & $<$$6.9(-12)$ \\
    & 50 & 100 & 365 $\pm$ 55& $<$73& & $<$0.13 & 1.5 & $<$$8.7(-12)$ \\
    & 70 & 80 & 165 $\pm$ 40& 100 $\pm$ 10& 0.61 & 0.17 &$<$0.7 & \\
    \hline
  \end{tabular}}
  \vspace*{4mm}
  \end{table}