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Scatter plot of mass accuracy. Shown are the worst accuracy in each peptide’s isotope cluster. The only filtering used was the requirement that an isotopomer abundance needed to be larger than 0.1% of the maximum abundance isotope for the particular peptide under consideration. Data for 1000 randomly chosen peptides are shown. The x axis shows the absolute values of the relative abundances. The sum of all isotope abundances is normalized to equal 1.
