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Table 2 The frequencies that different fragment ion types have observed peaks in the training ETD data.

From: Better score function for peptide identification with ETD MS/MS spectra

Ion z' c y z b a
Frequency 81.9% 79.9% 70.2% 45.3% 40.5% 37.9%
Ion z'2+ y-H2O C-H2O z'-NH3 a-NH3 b-H2O
Frequency 34.3% 30.8% 29.3% 27.2% 24.9% 24.5%
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