distribute	reads
0-500	86216
500-800	1594
800-1000	74
1000-1200	11
1200-1400	3
1400-1600	2
1600-1800	2
1800-2000	1
2000-2200	0
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	0
>3000	0
