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Fig. 5

image

[CII]/[OI] vs. ([CII]+[OI])/TIR to determine the ambient UV radiation field incident on the PDR regions. The [CII] emission has been corrected for a 10% contribution from the diffuse ionized ISM. The underlying grid is the Kaufman et al. (1999) PDR model for different densities and stellar radiation field strengths. The inset sub-panel is a zoom-in of the region of interest. Data points in the east/west side of the ring are indicated in blue/red.

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