Table 2. Number of IS insertions landing within d of closest preexisting copy.

	IS1A			IS5A			IS2
d	Observed	Expected	P	Observed	Expected	P	Observed	Expected	P
1000	5	0.5	1.8 × 10−4	19	1.5	4.2 × 10−15	1	0.2	0.19
5000	21	2.6	4.3 × 10−13	42	7.8	1.6 × 10−18	1	1.0	0.64
10 000	23	5.1	2.7 × 10−9	53	15.5	8.3 × 10−15	1	2.0	0.86
50 000	37	25.1	0.011	119	72.7	7.4 × 10−9	6	8.8	0.89
100 000	58	48.0	0.064	181	131.5	7.2 × 10−9	11	16.3	0.95
200 000	91	87.6	0.35	245	216.5	1.2 × 10−3	46	29.2	4.8 × 10−5
300 000	122	120.2	0.43	298	271.2	4.6 × 10−4	65	39.5	3.5 × 10−11
Total	233			361			71