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Fig. 1
Spectra of the detected HC3N(J = 2−1) in NGC 660, M 66, and IC 342 by the Effelsberg. The bottom row also shows the stacked spectra and the spectra of Mrk 231 from Aladro et al. (2015). Blue dashed lines are the Gaussian fit of the HC3N 2-1 lines. The temperature scale is Tmb in mK.
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