Comet C/2012 F6 (Lemmon): average on-nucleus spectrum of the HCN (3−2) line at 265.886 GHz obtained with the IRAM 30 m telescope between 14 March and 8 April 2013. Spectra covering the same velocity range obtained at similar times for H13CN (3−2) (259.012 GHz) and HC15N (3−2) (258.157 GHz) are also shown for comparison, but do not show a clear detection. Vertical scale is main beam brightness temperature and horizontal scale Doppler velocity in the comet rest frame.
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