Main SlopeTree plots.

(A) Number of matches between Escherichia coli K-12 and Lactobacillus sakei 23K for range of nit-scores available to 20-mers (black), and same plot from randomized data (blue). (B) Natural log of number of matches between same bacteria as in (A) (black), and corresponding plot in natural log from randomized data (blue). (C) Natural log of number of matches between 2 bacteria of the same species, using 20-mers (black) and 40-mers (orange). (D) “Evolutionary signal” extracted from (B). (E) E.coli 042 compared to 3 bacteria: E.coli 536 (black); Petrotoga mobilis S85 (blue); and Pyrolobus fumarii 1A (orange). (F) Natural log of number of matches between Syntrophobacter fumaroxidans MPOB and Dehalogenimonas lykanthroporepellens, a pair exhibiting HGT.