distribute	reads
0-500	6273
500-800	4666
800-1000	3627
1000-1200	4616
1200-1400	6540
1400-1600	10144
1600-1800	16805
1800-2000	25941
2000-2200	35652
2200-2400	43549
2400-2600	46439
2600-2800	44207
2800-3000	37291
>3000	112948
