Slopes of fits for the individual ion species investigated; asterisks: COSAC (data listed in Table 3), diamonds: Ptolemy, square: Ptolemy m/z 28 corrected for CO2 fragmentation. The error bars display 1σ uncertainties for the slopes derived from fitting exponentials to the data, taking into account uncertainties in instrumental background. The horizontal lines indicate the values for the total ion counts (TIC) for COSAC (long dashes) and Ptolemy (dash-dots).
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