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Fig. 4


PDR diagnostic diagrams for ratios of 12CO(J=15-14), 12CO(J = 7−6) and 12CO(J = 4−3) versus ([O i] 63 μm + [C ii] 158 μm)/ ΣFIR. In each figure the blue and red points represent the values found for IRAS 23133+6050 and S 106 respectively. The data points indicate a much denser environment with a stronger UV field than that seen for the fine-structure line diagnostics.

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