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. Author manuscript; available in PMC: 2016 Feb 11.
Published in final edited form as: J Am Soc Mass Spectrom. 2015 Sep 29;26(11):1837–1847. doi: 10.1007/s13361-015-1252-5

Figure 2. Histograms of mass differences between measured precursor m/z values and theoretical m/z values for the PSM assignments.

Figure 2

Representative histograms of mass differences between measured precursor m/z values and theoretical m/z values for the PSM assignments by the first pass search on the left, and PSM assignments after reSpect and re-search of a 48 fraction HeLa cell lysate dataset on right. In the left panel, the strong feature at 0 corresponds to the narrow m/z tolerance of the search, while the features at +1 and +2 Daltons are due to misassigned primary isotopes.