Fig. 2
Spectra of detected HC3N(J = 24−23) in NGC 1068, IC 342 and IC 694 by the SMT. At the bottom left, the spectra of NGC 1068 from Aladro et al. (2015) are shown for comparison. Blue dashed line is the Gaussian fit. We note that, in IC 694, it is difficult to distinguish the HC3N emission from the possibly blended H2CO lines. The temperature scale is Tmb in mK.
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