VDL# Farm Type Allele.1 Allele.2 Allele.3 Allele.440
828441 3 FF 0 0 1 0
828451 3 FF 0 0 1 0
822974 9 FF 0 0 1 0
832587 21 GAL 0 1 0 0
832588 21 GAL 1 1 0 0
Table 1: Part of the original AFLP data for illustration. Each row of the datasetcontains genetic information for one Salmonella isolate. The columns are: theVDL number (sample ID); the farm number; the source of data: data were eithercollected from feces before slaughter (FF) or were collected from lymph nodes afterslaughter (GAL); the genetic information for each of 440 alleles obtained by theAFLP method for the Salmonella isolate, where “1” means that the correspondingallele was detected in the corresponding isolate and “0” otherwise.