distribute	reads
0-500	2726
500-800	6098
800-1000	3678
1000-1200	6268
1200-1400	11166
1400-1600	16557
1600-1800	22059
1800-2000	24431
2000-2200	23739
2200-2400	20132
2400-2600	15705
2600-2800	11666
2800-3000	8931
>3000	21163
