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Table 3

Cloud model parameters.

Parameter Symbol Values
Gas density n⟨H⟩ 2 × 104  cm−3
Temperature Td = Tg 10–700 K
Extinction AV 10
Strength of interstellar UV χISM 1
Cosmic ray H2 ionisation rate ζCR 1.7 × 10−17 s−1
Mean grain radius r 10−5 cm
Dust-to-gas mass ratio δ 0.01
PAH abundance rel. to ISM fPAH 1

Notes. χISM = 1 is the ISM Draine UV field. fPAH = 1 corresponds to a PAH abundance of 3 × 10−7.

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