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. Author manuscript; available in PMC: 2009 Mar 30.
Published in final edited form as: Int J Mass Spectrom. 2007 Jan 1;259(1-3):105–116. doi: 10.1016/j.ijms.2006.08.004

Fig. 7.

Fig. 7

Frequency histograms of 26 identified peptides of P13793|FMA_PORGI, major fimbrillin A observed in sample PG_nm. The large variations in spectral counts and intensity distributions between different peptides can explain why the relative standard deviations of peptide level methods are so high. The y-axis of each histogram represents the number of peptide spectra in each bin. The x-axis represents signal intensity in units of log10 data system counts.