\begin{table}%T1
\caption{Observations of the Orion Bar.}\label{tab1}
\par
%\centerline
 {
\small
\begin{tabular}{lcc}
\hline \hline
&Orion Bar (CO) & Orion Bar (HCN) \\
\hline\noalign{\smallskip}
&\multicolumn{2}{l}{Line strength$^a$ ($\int T_{\rm A}^* {\rm d}v$ in $\rm mK~km~s^{-1}$)} \\
$J=1{-}0$ & \phantom{0}$86 \pm 10$  &  \phantom{0}$72 \pm  8$\phantom{0} \\
$J=2{-}1$ & $337 \pm 13$ & $215 \pm 13$ \\
$J=3{-}2$ & $428 \pm 34$ & $183 \pm 26$ \\
&\multicolumn{2}{l}{Line centroid ($\rm km~s^{-1}$ w.r.t. the LSR)}\\
$J=1{-}0$ & $10.5  \pm 0.15$ &  $\phantom{0}9.6  \pm 0.15$  \\
$J=2{-}1$ & $10.7  \pm 0.05$ &  $\phantom{0}9.8  \pm 0.05$  \\
$J=3{-}2$ & $10.6  \pm 0.1$\phantom{0}  &  $10.0 \pm 0.1$ \\
&\multicolumn{2}{l}{Line width ($\rm km~s^{-1}$ {\it FWHM})}\\
$J=1{-}0$ & $2.7\pm 0.4$ & $2.3 \pm 0.3$ \\
$J=2{-}1$ & $2.0\pm 0.1$ & $1.7 \pm 0.1$ \\
$J=3{-}2$ & $3.0\pm 0.3$ & $1.5 \pm 0.2$ \\
&\multicolumn{2}{l}{Column density (units of $\rm 10^{11}~cm^{-2}$)} \\
$J=1$ & 3.7 & 3.1 \\
$J=2$ & 6.0 & 3.8 \\
$J=3$ & 4.7 & 2.0 \\
Estimated total & 19 & 11 \\
\hline 
\end{tabular}}
\smallskip
$^a$ Errors given are 1 sigma statistical errors.  We estimate
the systematic uncertainties as $\pm $20\%.
\end{table}