distribute	reads
0-500	3562
500-800	35
800-1000	22
1000-1200	12
1200-1400	11
1400-1600	8
1600-1800	7
1800-2000	2
2000-2200	8
2200-2400	6
2400-2600	5
2600-2800	1
2800-3000	4
>3000	32
