Database Database Size Query
Size		 Candidates Size Average Candidate Size Coarse Filtering Rate
PeptideAtlas 9,421

44

 654 14.9 0.158%
OPD 494,049

202

 68,610 339.7 0.069%
ISB 1,248,212

995

 101,443 102.0 0.008%
Table 4: Candidates’ size, average candidate size and coarse filtering rate. “Candidates size” is the combined total results from coarse filtering of the database using the query size as input query points for the MPRQ algorithm. “Average Candidate Size” is the average peptide sequence candidates for each spectrum (query). “Coarse Filtering Rate” is computed by “average candidate size” over the database size.