Comet C/2014 Q2 (Lovejoy): average on-nucleus spectra of the HCN (3−2) line at 265.886 GHz, H13CN (3−2) line at 259.012 GHz, and HC15N (3−2) line at 258.157 GHz obtained with the IRAM 30 m telescope on 13–24 January 2015. For HC15N (3−2) the spectrum obtained with the VESPA autocorrelator (thick line) is superimposed on the FTS spectrum. Vertical scale is main beam brightness temperature and horizontal scale Doppler velocity in the comet rest frame.
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