distribute	reads
0-500	7484
500-800	7508
800-1000	6860
1000-1200	9612
1200-1400	14142
1400-1600	20848
1600-1800	28896
1800-2000	37418
2000-2200	43817
2200-2400	48223
2400-2600	46778
2600-2800	40834
2800-3000	32304
>3000	89313
