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Fig. 8


12CO (diamonds) and 13CO (triangles) rotation diagrams for IRAS 23133+6050 and S 106. Two ultra-compact H ii regions from the Karska et al. (2014) sample which display the warm CO component are also shown as orange, purple lines. Simple fits to the lower-J CO lines are shown to demonstrate the deviation of the higher-J CO levels from this trend for S 106 and the Karska sources. A fit to the highest-J CO lines for S 106 is also included. The Karska sources have been offset in y for clarity. The first 12CO and 13CO points for both of our sources are 43 and 54 respectively.

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