Fig. A.1
H2 2−1/1−0 S(1) intensity line ratio estimated from the PDR Meudon code for a grid of radiation fields and gas pressures. The measured value for the low-velocity component is 0.32, which is highlighted in the figure. The red area marks 1σ uncertainty associated with this value. Triangles represent the values given in Table A.1, estimated from the H ii/PDR model for radii from 30 to 100 pc.
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