. Author manuscript; available in PMC: 2008 Sep 25.

Published in final edited form as: Anal Chem. 2007 Mar 17;79(8):3032–3040. doi: 10.1021/ac061455v

Table 1.

Frequency of each ion type observed in the data set. The superscript ° represents the neutral loss of water (~18 Da), and * represents the neutral loss of ammonia (~17 Da). The CI’s column shows the 95% confidence intervals as the percentage of the corresponding reported values.

Ion Type	Frequency	CI’s

Unassigned	0.21	±8%
internal	0.16	±4%
y ion	0.12	±5%
immonium	0.11	±5%
b ion	0.091	±4%
internal^o	0.055	±8%
internal*	0.05	±7%
y*	0.045	±10%
a ion	0.042	±5%
b°	0.025	±10%
y^o	0.0201	±10%
b*	0.017	±11%
a*	0.013	±10%
a°	0.0099	±10%
x ion	0.0089	±14%
c ion	0.0087	±15%
precursor*	0.0069	±45%
z ion	0.0056	±14%
precursor^o	0.00015	±28%