distribute	reads
0-500	2394
500-800	1621
800-1000	591
1000-1200	980
1200-1400	1911
1400-1600	2974
1600-1800	3934
1800-2000	4392
2000-2200	4535
2200-2400	4597
2400-2600	4537
2600-2800	2773
2800-3000	2346
>3000	7099
