Left: COSAC measurements #1 to 5 (Table 1) corrected for instrumental backgound. Spectrum #0 was used for background correction. The noise is about 10 ion counts per integer m/z bin. Right: same for Ptolemy. Corrections for instrumental background and CO2 fragmentation were applied (see text for details). Exponential slopes were fitted to the data (Table 3). As for Fig. 2, the time axis is set to zero at Philae’s touchdown.
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