distribute	reads
0-500	0
500-800	17
800-1000	4
1000-1200	6
1200-1400	0
1400-1600	2
1600-1800	1
1800-2000	1
2000-2200	0
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	1
>3000	0
