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Fig. 1

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HC3N 10-9 spectra for Arp 220, IRAS 17208-0014 (detections), NGC 2146 (non-detection), NGC 3079 (detection), and UGC 5101 (non-detection). For Arp 220 and IRAS 17208-0014, part of the HNC 1-0 line is also visible. Some of the reported HC3N 10-9-detections are found in the HNC 1-0 spectra, see Fig. 7.

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