Fig. 12
log-log plot of the HC3N/HCN line ratio versus the HNC/HCN line ratio. The HC3N/HCN values for IC 342, Maffei 2, M82, and NGC 253 are probably overestimated (indicated by thin error bars, see Appendix A.1). The objects for which the HC3N 12-11 line has been used instead of the HC3N 10-9 line when calculating the HC3N/HCN ratio are indicated by a star.
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