Fig. 5
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Excitation diagram and level population of CH+ and H2 in d203-506 and in the Bar. (Left) Excitation diagram of CH+ (a) in the Bar and (c) in d203-506. (Right) Level population of H2 normalized to the total column density (see Table 1) (b) in the Bar and (d) in d203-506. The difference in H2 population distribution can explain the difference in the excitation diagram of CH+.
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