distribute	reads
0-500	9826
500-800	140
800-1000	25
1000-1200	17
1200-1400	17
1400-1600	7
1600-1800	9
1800-2000	6
2000-2200	6
2200-2400	1
2400-2600	1
2600-2800	1
2800-3000	3
>3000	8
