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Table 5

Column densities N[cm-2] predicted by the PDR models. Models 1–15 and 18–21 are isochoric (constant nH) models 16 and 17 are isobaric.

Model Av [mag]  nH [cm-3 N(H2) N(H) N(C+) N(C) N(CO) N(CH) N(C2H2) N(CH2) N(CCH) N(C3H2)*

1 5 100 4.5E21 3.9E20 7.6E17 3.9E17 7.4E16 6.3E14 1.1E12 4.6E14 3.0E14 8.4E11
2 5 250 4.6E21 1.8E20 5.9E17 4.3E17 1.9E17 6.1E14 1.7E12 5.4E14 3.4E14 1.5E12
3 5 500 4.6E21 1.1E20 4.8E17 4.3E17 3.0E17 5.7E14 1.9E12 5.9E14 3.4E14 1.8E12
4 5 750 4.6E21 8.0E19 4.1E17 4.4E17 3.6E17 5.3E14 2.0E12 6.0E14 3.3E14 1.9E12
5 5 1000 4.6E21 6.6E19 3.7E17 4.4E17 4.0E17 5.0E14 2.0E12 6.0E14 3.3E14 2.0E12
6 3 100 2.7E21 3.1E20 6.6E17 7.5E16 3.5E15 3.2E14 7.5E10 1.7E14 1.1E14 5.8E10
7 3 250 2.7E21 1.5E20 5.7E17 1.5E17 1.8E16 3.9E14 2.8E11 3.0E14 1.8E14 2.2E11
8 3 500 2.8E21 9.2E19 4.7E17 2.0E17 5.3E16 4.1E14 6.4E11 4.1E14 2.3E14 4.9E11
9 3 750 2.8E21 7.0E19 4.1E17 2.2E17 8.9E16 4.1E14 9.4E11 4.6E14 2.5E14 7.3E11
10 3 1000 2.8E21 5.9E19 3.7E17 2.3E17 1.2E17 4.1E14 1.2E12 4.8E14 2.6E14 9.2E11
11 1 100 8.3E20 2.2E20 2.5E17 1.4E15 5.2E13 4.6E13 7.0E08 1.6E13 5.4E12 3.8E08
12 1 250 8.9E20 9.6E19 2.4E17 4.4E15 4.2E13 9.2E13 6.0E09 4.4E13 2.4E13 5.5E09
13 1 500 9.1E20 5.6E19 2.4E17 1.0E16 1.0E14 1.3E14 2.3E10 8.2E13 4.9E13 2.3E10
14 1 750 9.1E20 4.3E19 2.3E17 1.6E16 2.0E14 1.4E14 4.4E10 1.1E14 6.4E13 4.2E10
15 1 1000 9.2E20 3.6E19 2.2E17 2.2E16 3.3E14 1.5E14 6.7E10 1.3E14 7.3E13 6.0E10
model Av [mag]  p [K   cm-3 N(H2) N(H) N(C+) N(C) N(CO) N(CH) N(C2H2) N(CH2) N(CCH) N(C3H2)*
16 5 3500 4.4E21 5.9E20 5.6E17 3.8E17 2.8E17 4.6E14 1.5E12 4.2E14 2.5E14 1.5E12
17 5 10000 4.6E21 1.1E20 3.9E17 3.8E17 4.4E17 4.1E14 1.5E12 4.6E14 2.5E14 1.6E12

model Av [mag]  ζ [s-1] N(H2) N(H) N(C+) N(C) N(CO) N(CH) N(C2H2) N(CH2) N(CCH) N(C3H2)*
18 5 1E-16 4.6E21 1.4E20 4.9E17 4.7E17 2.5E17 6.3E14 2.5E12 6.8E14 4.0E14 2.4E12
19 5 2E-16 4.6E21 2.2E20 5.1E17 5.0E17 1.9E17 7.4E14 3.5E12 8.5E14 5.0E14 3.1E12
20 3 1E-16 2.8E21 1.1E20 4.8E17 2.0E17 4.6E16 4.2E14 6.6E11 4.2E14 2.4E14 5.0E11
21 3 2E-16 2.7E21 1.6E20 4.8E17 2.0E17 3.6E16 4.4E14 7.0E11 4.5E14 2.6E14 5.2E11



PDR models do not separate cyclic and linear C3H2.

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