distribute	reads
0-500	9
500-800	5
800-1000	0
1000-1200	0
1200-1400	0
1400-1600	1
1600-1800	2
1800-2000	1
2000-2200	2
2200-2400	2
2400-2600	0
2600-2800	0
2800-3000	4
>3000	4
