distribute	reads
0-500	275016
500-800	10530
800-1000	667
1000-1200	138
1200-1400	28
1400-1600	11
1600-1800	3
1800-2000	0
2000-2200	1
2200-2400	1
2400-2600	1
2600-2800	0
2800-3000	0
>3000	0
