distribute	reads
0-500	5
500-800	2
800-1000	2
1000-1200	0
1200-1400	0
1400-1600	0
1600-1800	0
1800-2000	1
2000-2200	1
2200-2400	0
2400-2600	0
2600-2800	2
2800-3000	3
>3000	9
