distribute	reads
0-500	28775
500-800	16991
800-1000	7810
1000-1200	6187
1200-1400	5163
1400-1600	4169
1600-1800	3587
1800-2000	3008
2000-2200	2665
2200-2400	2310
2400-2600	2021
2600-2800	1732
2800-3000	1514
>3000	14451
