Table I. Summary of the estimated fold change. Fold Change = 2 (model-based estimate of log[Fold Change]).

	Filtered	Min	Q1	Median	Q3	Max	Interquartile range
No background	MS1 and MS2	2.232	2.619	2.790	2.935	5.524	0.316
	MS2 only	2.205	2.606	2.772	2.926	5.526	0.32
	MS1 only	2.232	2.607	2.789	2.935	5.524	0.328

	Unfiltered	Min	Q1	Median	Q3	Max	Interquartile range
No background	MS1 and MS2	2.145	2.619	2.788	2.966	5.525	0.347
	MS2 only	1.988	2.583	2.755	2.926	5.526	0.343
	MS1 only	2.083	2.729	2.867	3.048	5.505	0.319

	Filtered	aMin	Q1	Median	Q3	bMax	Interquartile range
E. coli background	MS1 and MS2	1.412	2.296	2.428	2.581	3.024	0.285
	MS2 only	1.854	2.254	2.415	2.566	3.054	0.312
	MS1 only	1.068	2.257	2.419	2.563	3.400	0.306

	Unfiltered	aMin	Q1	Median	Q3	bMax	Interquartile range
E. coli background	MS1 and MS2	1.437	2.134	2.333	2.503	3.015	0.369
	MS2 only	1.408	2.085	2.325	2.500	3.037	0.415
	MS1 only	1.068	2.225	2.529	2.734	3.602	0.509

^a Excludes bottom 1%.

^b Excludes top 1%.