distribute	reads
0-500	0
500-800	0
800-1000	0
1000-1200	0
1200-1400	0
1400-1600	0
1600-1800	0
1800-2000	0
2000-2200	11887
2200-2400	11284
2400-2600	11044
2600-2800	10653
2800-3000	10137
>3000	568340
