Table 3: Column densities for the various molecules from statistical equilibrium calculations.
Molecule $N({\rm core)}$a $N({\rm wing})$a
  [cm-2] [cm-2]
COb 5.1 $~\times~ 10^{17}$ 1.2 $~\times~ 10^{17}$
CH3OH 3.4 $~\times~ 10^{15}$ 5.8 $~\times~ 10^{15}$
CS 5.4 $~\times~ 10^{13}$ 3.2 $~\times~ 10^{13}$
HCN 1.1 $~\times~ 10^{13}$ 5.7 $~\times~ 10^{12}$
HCO+ 6.6 $~\times~ 10^{12}$ 3.5 $~\times~ 10^{12}$
H2CO 8.9 $~\times~ 10^{13}$ 1.8 $~\times~ 10^{13}$
N2H+ 9.0 $~\times~ 10^{12}$ $\ldots$
SiO $\ldots$ 1.4 $~\times~ 10^{14}$
SO 6.2 $~\times~ 10^{13}$ 1.3 $~\times~ 10^{14}$
Notes: aCalculated for $n_{\rm H_2} = 1\times 10^6~{\rm cm}^{-3}$and T=20 K (core) and T=80 K (wing). bBased on 12CO measurements for the column densities in the wings and C18O measurements for the core (assuming a 16O/18O isotope ratio of 540).

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