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Table 4

Parameters of the PDR models

Radiation field G0 1
Helium abundance 0.1
Oxygen abundance 3.2 × 10-4
Carbon abundance 1.3 × 10-4
Nitrogen abundance 7.5 × 10-5
Fe abundance 1.5 × 10-8
Cosmic ray ionization rate ζ 5 × 10-17 s-1
RV = AV/E(B − V) 3.1
Gas to Dust ratio 100
Grain size distribution index 3.5
Minimum grain radius 0.003 μm
Maximum grain radius 0.3 μm

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