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Fig. 8. Boltzmann plot of the H2 pure rotational lines observed in HH54 by ISOSWS. Note how the ortho (J odd) and para (J even) lines display along two different lines in the diagram, where the ortho/para ratio is equal to the equilibrium value of 3. The observed displacement is consistent with an ortho/para ratio equal to 1.2 (from [33])

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