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Table 3

Molecular data.

Transition ν Eu ncrit A
(GHz) (K) (104 cm-3) (10-6 s-1)
(1) (2) (3) (4) (5)

13CO (21) 220.39868 15.87 8.4 6.038
C18O (21) 219.56035 15.81 8.4 6.011
12CO (32) 345.79599 33.19 3.8 2.497
13CO (32) 330.58797 31.73 3.3 2.181
C18O (32) 329.33055 31.61 3.3 2.172

Notes. Column 1 gives the transition observed and Col. 2 gives the frequency of the observed transition. Column 3 gives the energy, in units of Kelvin, of the upper level of the transition and Col. 4 gives the critical density of the transition. Column 5 gives the Einstein A coefficient for the transition. All molecular data are based upon data in the Leiden Atomic and Molecular Database (LAMDA; Schöier et al. 2005). Data in the LAMDA partially come from the National Aeronautics and Space Administration (NASA) Jet Propulsion Laboratory (JPL) database (Pickett et al. 1998) and the Cologne Database for Molecular Spectroscopy (Müller et al. 2001, 2005).

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