Fig. 8
Tentative correlation between HC3N/HCN ratio and silicate absorption strength. The HC3N/HCN values for IC 342, NGC 253, and M82 are probably overestimated (indicated by thinner 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. The silicate absorption strength is in a magnitude scale: A higher negative number means stronger silicate absorption.
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