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Table 2:

Molecular column densities*.

Mol 		$T_{\rm rot}$ Observed PDR Model
  (K) (cm-2) (cm-2)

13CO 		27 $4.7 \times 10^{16}$ $3.5 \times 10^{16}$b
C18O 34 $6.9 \times 10^{15}$ $3.5 \times 10^{15}$b
H13CO+ 20c $1.7 \times 10^{12}$c $9.3 \times 10^{11}$b
CS 25 $6.3 \times 10^{13}$ $6.7 \times 10^{13}$
o-H218O 8.5a $2.7 \times 10^{12}$ $2.9 \times 10^{12}$b,d
CH 19a $5.6 \times 10^{13}$ $3.3 \times 10^{14}$
NH 10-20a 1- $5 \times 10^{13}$ $5.1\times 10^{11}$

Notes. (*) The rotational diagrams used the 30 m and HIFI lines; (a) assumed rotational temperature; (b) assuming 12C/13C = 50 and 16O/18O = 500; (c) from Rizzo et al. (2005); (d) assuming an ortho-to-para ratio of 3.


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