Table 1: Observations of the Orion Bar.
  Orion Bar (CO) Orion Bar (HCN)
  Line strengtha ( $\int T_{\rm A}^* {\rm d}v$ in $\rm mK~km~s^{-1}$)
J=1-0 $86 \pm 10$ $72 \pm 8$
J=2-1 $337 \pm 13$ $215 \pm 13$
J=3-2 $428 \pm 34$ $183 \pm 26$
  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 $10.6 \pm 0.1$ $10.0 \pm 0.1$
  Line width ( $\rm km~s^{-1}$ 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 $3.0\pm 0.3$ $1.5 \pm 0.2$
  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
a Errors given are 1 sigma statistical errors. We estimate
the systematic uncertainties as $\pm $20%.


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