Table 3.

Kendall's tau (rank correlation) comparing the most significant exact p-values (the reference) to the Karlin's approximations. The column "all" gives the result for all sequences while the R_i give the results for a certain range of sequence lengths: smaller than 100 for R1, between 100 and 200 for R2, between 200 and 500 for R3, between 500 and 1 000 for R4, between 1 000 and 2 000 for R5 and greater than 2 000 for R6.

number of p-values	all	R1	R2	R3	R4	R5	R6
10	0.30	0.64	0.24	-0.20	0.58	0.64	0.97
50	0.14	0.73	0.50	0.46	0.56	0.78	0.97
100	0.37	0.70	0.67	0.62	0.61	0.80	0.98