distribute	reads
0-500	83
500-800	44
800-1000	5
1000-1200	5
1200-1400	0
1400-1600	1
1600-1800	1
1800-2000	2
2000-2200	3
2200-2400	3
2400-2600	2
2600-2800	8
2800-3000	4
>3000	69
