distribute	reads
0-500	87546
500-800	974
800-1000	25
1000-1200	8
1200-1400	2
1400-1600	0
1600-1800	0
1800-2000	0
2000-2200	0
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	0
>3000	0
