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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2012 Sep 25;23(12):2075–2082. doi: 10.1007/s13361-012-0482-z

Figure 1. Theoretical fragment ion map.

Figure 1

The theoretical fragment ion map is plotted for m/z 635–695. The map was generated by summing over 100,000 fragmentation spectra. The peaks repeating every ~1.0005 m/z represent regions where a singly charged b or y-ion is theoretically likely to occur in a peptide fragmentation spectrum. The inset is a zoomed view of a subset of the fragment ion map. Notably, there are repeating regions in m/z-space where these peaks do not occur due to most peptides having a similar mass excess.