TABLE 1 

Comparison of the number of features and metabolites resulting from various levels of curation

Analytical
column
No. of features
after three-way visualization
analysis
No. of metabolites
After manual
curation
Containing
nitrogen
With chemical
formula
Agilent Zorbax
SB-C18 column
191562738
Acquity UPLC BEH
HILIC column
50241918