Left: temporal behaviour of ion species with m/z 18 (H2O), 28 (CO), 44 (partially CO2) and total ion counts (TIC), respectively, derived from the seven COSAC spectra (raw counts, not corrected for instrumental background). Right: ptolemy data taken from Morse et al. (2015, their Table 3, corrected for hydrogen abstraction, a feature of the ion trap employed in Ptolemy). The time axis is set to zero at Philae’s touchdown on 12 November 2014, 15:34:04 UTC (see text for details).
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