distribute	reads
0-500	4085
500-800	10544
800-1000	8294
1000-1200	9699
1200-1400	11703
1400-1600	12607
1600-1800	12276
1800-2000	11717
2000-2200	10644
2200-2400	9522
2400-2600	8670
2600-2800	7757
2800-3000	6884
>3000	40350
