\begin{table}%T3
\caption{Central CO and CI line intensities in M~51.}
\label{m51int}
%\centerline
 {
\begin{tabular}{rlrrcrc}
\hline\hline
\noalign{\smallskip}
\multicolumn{2}{l}{Transition} & Resolution & $T_{\rm mb}$ & $\int T_{\rm mb}$d$V$ & $T_{\rm mb}$ & $\int T_{\rm mb}$d$V$ \\
&       & ($\arcsec$)    & (mK) & ($\kkms$) & (mK) & ($\kkms$) \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
& & & \multicolumn{2}{c}{Position A:} & \multicolumn{2}{c}{Position B:}\\
& & & \multicolumn{2}{c}{Center}      & \multicolumn{2}{c}{NW Arm GMA-1}\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
$\co$   & $J=2{-}1$ & 21 &  260 &  $38.8\pm8.5$ &  805 &  $54.0\pm7.5$ \\
        &          & 43 &  -- &  $44.5\pm9.0$ &  -- &  $36.0\pm7.2$ \\
$\treizeco$ &	   & 21 &  -- &      --      &   77 &   $7.5\pm1.0$ \\
$\co$   & $J=3{-}2$ & 14 &  375 &  $42.7\pm6.5$ & 1535 &  $64.5\pm9.5$ \\
        &	   & 21 &  -- &  $30.2\pm6.0$ &  -- &  $55.0\pm9.5$ \\
$\treizeco$ &          & 14 &   28 &   $3.3\pm0.7$ &   43 &   $5.5\pm1.5$ \\
$\co$   & $J=4{-}3$ & 11 &  160 &  $27.0\pm4.5$ &  520 &  $52.5\pm7.5$ \\
        &	   & 14 &  -- &  $23.0\pm4.5$ &  -- &  $33.0\pm7.0$ \\
        &	   & 21 &  -- &  $19.0\pm3.8$ &  -- &  $24.0\pm4.0$ \\
\noalign{\smallskip}
[CI] & $^{3}$P$_{1}$--$^{3}$P$_{0}$ & 10 & -- &  -- & 565 & $28\pm5$ \\
	&          & 21 &  -- &      --      &  -- & $(13\pm4)$   \\
\noalign{\smallskip}
\hline
\end{tabular}}
\smallskip
Note: Position A: beam centered on nucleus; 
Position B: beam centered on Giant Molecular Association 1 in
NW spiral arm at offsets $\Delta\alpha = -10''$, 
$\Delta\delta=+15''$ with respect to the nucleus.
\end{table}