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Fig. A.2

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Grid of OH LVG models for different gas temperatures and densities. Contour levels of the OH J = 9/2+–7/2/J = 3/2–5/2+ (65.279/96.363 μm) line ratio for N(OH) = 1016 cm-2. Note the gas temperature dependence of this ratio. The black continuous curves enclose the observed intensity line ratio with a  ~15% of relative flux calibration error.

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