. Author manuscript; available in PMC: 2020 Sep 27.

Published in final edited form as: J Proteome Res. 2019 Jul 29;18(9):3268–3281. doi: 10.1021/acs.jproteome.9b00216

Table 7.

Most Frequent d = 16 Gap Pairs (i.e., m_j − m_i) on 1891 Glycoprotein Standard Spectra^a

rank	mass	molecule
1	18.00000	water
2	0.02500
3	0.97500	neutron/deamidation
4	113.07500	I/L
5	203.07500	HexNAc
6	17.02500	ammonia
7	17.00000	ammonia
8	1.00000	neutron/deamidation
9	0.05000
10	101.02500	T
11	0.00000
12	18.02500	water
13	17.97500	water
14	27.97499
15	113.05000	I/L
16	203.05000	HexNAc
18	162.05000	Hexose
54	146.05000	dHex
914	291.12500	NeuAc
rank	mass	molecule
1	18.00000	water
2	0.02500
3	203.07500	HexNac
4	113.07500	I/L
5	0.97500	neutron/deamidation
6	17.02500	ammonia
7	0.00000
8	17.00000	ammonia
9	0.05000
10	162.05000	hexose
11	101.02500	T
12	35.99999
13	1.00000	neutron/deamidation
14	203.05000	HexNac
15	41.02499
16	17.97500	water
53	146.05000	dHex
1112	291.10500	NeuAc

Top table ranks using the unweighted frequency of gaps; bottom table weights each gap by the product of peak intensities p_i·p_j. Masses are rounded to five decimal points.