distribute	reads
0-500	2720
500-800	167
800-1000	45
1000-1200	27
1200-1400	21
1400-1600	12
1600-1800	13
1800-2000	8
2000-2200	3
2200-2400	0
2400-2600	2
2600-2800	1
2800-3000	1
>3000	17
