Table 9: Observations of the Milky Way nucleus (from Fixsen et al. 1999), NGC 253 (from this paper), Henize 2-10 (from this paper) and the Cloverleaf QSO (from Barvainis et al. 1997; Tsuboi et al. 1999; Weiß et al. 2003).
F Milky Way NGC 253 Henize 2-10 Cloverleaf
(W m-2)        
CI(3P1-3P0) $1.9\times 10^{-11}$ $4.6\times10^{-16}$ $3.8\times10^{-18}$ $1.7\times 10^{-23}$
CI(3P2-3P1) $1.9\times 10^{-11}$ $4.0\times10^{-16}$ Not observed $3.9\times 10^{-23}$
12CO(1-0) $2.7\times 10^{-12}$ $2.0\times10^{-17}$ $4.8\times10^{-19}$ $\le$ $1.5\times 10^{-24}$
12CO(2-1) $1.1\times 10^{-11}$ $1.9\times10^{-16}$ $2.5\times10^{-18}$  
12CO(3-2) $2.0\times 10^{-11}$ $4.4\times10^{-16}$ $9.0\times 10^{-18~a}$ $4.3\times 10^{-23}$
12CO(4-3) $3.0\times 10^{-11}$ $1.3\times10^{-15}$ $1.4\times10^{-17}$ $9.1\times 10^{-23}$
12CO(5-4) $2.8\times 10^{-11}$ $2.2\times 10^{-15~b}$ $3.3\times 10^{-17~b}$ $1.3\times 10^{-22}$
12CO(6-5) $2.0\times 10^{-11}$ $2.2\times10^{-15}$ $2.9\times10^{-17}$  
12CO(7-6) $1.7\times 10^{-11}$ $1.7\times10^{-15}$ $4.0\times10^{-17}$ $3.6\times 10^{-22}$
12CO(8-7) $1.9\times 10^{-11}$ $6.7\times 10^{-16~b}$ $4.9\times 10^{-17~b}$  
a We chose to use 12CO(3-2) observations from Meier et al. (2001) because they seem to agree with LVG and PDR models (see Fig. 5) better than our observations.
b These values are computed from PDR models.


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