Figure 4

Z-score distributions. Distribution of the Z-scores of the 'best' alignments (red) and the best among the 'noise' alignments (black). The number of 'noise' alignments is small above Z-score of 10 and rises sharply below Z-score of 8.
Z-score distributions. Distribution of the Z-scores of the 'best' alignments (red) and the best among the 'noise' alignments (black). The number of 'noise' alignments is small above Z-score of 10 and rises sharply below Z-score of 8.