Table 1: Infrared pumping approximations.
Model $J_{\rm int}^{\rm D}$
PDR-a 0
PDR-b1 $\beta_{ij}\;\tau^{\rm D}_1\;I^{\rm D}$
PDR-b2 $\beta_{ij}\;\tau^{\rm D}_2\;I^{\rm D}$
PDR-c Eq. (14)

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