Table 4 Partial results of partial least squares discriminant analysis, indicating for each source group the ten most important UNID-consensus spectra (ranked 1 to 10) that differentiated the isolates of the group from those of the other three groups.

Source group	Rank	No. of isolates					Replicate MS/MS spectra per isolate				Sequence tag
Source group	Rank	Sewage	Cow	Dog	Pig	Total	Sewage	Cow	Dog	Pig	Sequence tag
Sewage	1	20	—	3	—	23	1.9	—	1.0	—	3
	2	18	—	4	4	26	4.3	—	1.0	1.5	7
	3	19	1	1	3	24	3.0	1.0	2.0	1.3	6
	4	19	—	4	4	27	3.3	—	1.0	1.5	4
	5	20	—	7	7	34	3.9	—	1.4	2.4	4
	6	16	—	2	3	21	1.9	—	2.0	1.3	5
	7	15	—	1	1	17	1.9	—	2.0	2.0	7
	8	19	—	10	7	36	3.6	—	1.4	2.0	5
	9	13	—	—	—	13	1.5	—	—	—	5
	10	17	—	9	6	32	4.5	—	1.6	1.8	5
Cow	1	1	19	—	2	22	1.0	4.5	—	2.0	5
	2	1	20	2	2	25	1.0	1.7	1.0	1.0	4
	3	1	18	—	1	20	1.0	1.8	—	1.0	6
	4	1	18	1	1	21	1.0	1.9	1.0	2.0	5
	5	2	19	—	5	26	1.5	2.1	—	1.2	11
	6	—	20	—	6	26	—	2.0	—	1.3	9
	7	3	20	2	8	33	1.0	1.7	1.0	1.0	6
	8	1	16	—	—	17	2.0	2.0	—	—	13
	9	—	17	—	3	20	—	1.9	—	1.0	6
	10	1	16	—	1	18	2.0	2.0	—	1.0	11
Dog	1	—	—	17	—	17	—	—	2.0	—	10
	2	—	—	17	—	17	—	—	5.9	—	5
	3	—	—	17	—	17	—	—	5.5	—	6
	4	—	—	17	—	17	—	—	1.7	—	7
	5	—	—	16	—	16	—	—	1.9	—	6
	6	—	—	16	—	16	—	—	19.8	—	5
	7	—	—	17	—	17	—	—	3.5	—	7
	8	—	—	16	—	16	—	—	1.8	—	5
	9	—	—	17	—	17	—	—	1.7	—	6
	10	—	—	16	—	16	—	—	2.3	—	11
Pig	1	1	5	6	13	25	1.0	1.2	2.0	3.4	7
	2	—	—	—	10	10	—	—	—	1.5	4
	3	—	3	4	13	20	—	1.7	2.5	3.1	7
	4	1	7	8	13	29	1.0	3.6	3.1	6.5	5
	5	—	1	2	12	15	—	3.0	1.5	2.3	4
	6	—	1	4	11	16	—	1.0	1.5	2.7	4
	7	—	2	4	12	18	—	5.5	4.3	6.1	4
	8	—	—	1	9	10	—	—	1.0	2.9	5
	9	—	—	1	10	11	—	—	2.0	1.7	3
	10	—	7	5	12	24	—	3.3	3.0	5.6	4

Data shown for each UNID-consensus spectrum are (i) the number of isolates that it was associated with in each source group, (ii) the average number of replicate MS/MS spectra derived from each associated isolate in a group, and (iii) the length of the longest sequence tag (i.e. no. of amino acids) identified using de novo sequencing.

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