Fig. 6.
Line ratios observed in different sources, normalized to the values measured for the headlight cloud in NGC 628. Yellow, blue, red, and green symbols correspond to the 12CO/13CO, CO(2–1)/CO(1–0), HCO+/HCN, and HCN/CO(1−0) values. The values given for 30 Dor correspond to the values in the 30 Dor-10 molecular cloud. The red arrow for 30 Dor indicates that the value of HCO+/HCN is higher than 2.5. See Table 5 for the absolute values for these line ratios and their references.
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