Distribution of the scores of PPP. The query profile contains all methanogens marked as 1, and the target genome is Methanohalophilus mahii DSM 5219. The binomial distribution probability parameter is raised to 0.2, which helps proteins absolutely restricted to the methanogens, although not universal among them, to get a better relative rank. The plot shows PPP score on the Y-axis, and rank, sorted by PPP score, on the X-axis. The top-scoring 28, with perfect agreement to the query profile, are colored red.