distribute	reads
0-500	0
500-800	10
800-1000	2
1000-1200	2
1200-1400	0
1400-1600	0
1600-1800	0
1800-2000	0
2000-2200	0
2200-2400	1
2400-2600	0
2600-2800	1
2800-3000	1
>3000	0
