distribute	reads
0-500	4776
500-800	4959
800-1000	3094
1000-1200	2897
1200-1400	2807
1400-1600	2606
1600-1800	2702
1800-2000	2962
2000-2200	3328
2200-2400	3903
2400-2600	4514
2600-2800	5575
2800-3000	6219
>3000	97037
