distribute	reads
0-500	23
500-800	15
800-1000	0
1000-1200	0
1200-1400	1
1400-1600	0
1600-1800	0
1800-2000	0
2000-2200	2
2200-2400	0
2400-2600	0
2600-2800	3
2800-3000	4
>3000	59
