Fig. 1From: Unsupervised statistical discovery of spaced motifs in prokaryotic genomesComparison between approximate and exact p-value cutoffs.n is the total number of occurrences of some motif pair; fcut indicates the cutoff value corresponds to the selected p value threshold. Solid and dashed lines represent approximate values calculated by formula (2) and exact values computed with SymPy, respectivelyBack to article page