Table 1: Parameters of the observed transitions used to study the PDRs in Cepheus B.
Species Transition $E_{\rm u}$/k $n_{\rm cr}$
    (K) (cm-3)

[C I]
3P1 $\rightarrow$ 3P0 23.6 $1\times10^3$
12CO 1-0 5.6 $4.8\times10^3$
13CO 2-1 16.8 $3.2\times10^4$
12CO 4-3 56 $2.6\times10^5$


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