distribute	reads
0-500	12299
500-800	8412
800-1000	5417
1000-1200	5256
1200-1400	4777
1400-1600	4715
1600-1800	4204
1800-2000	3886
2000-2200	3689
2200-2400	3515
2400-2600	3399
2600-2800	3294
2800-3000	2841
>3000	52684
