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% |
