distribute	reads
0-500	0
500-800	3
800-1000	0
1000-1200	4
1200-1400	0
1400-1600	4
1600-1800	3
1800-2000	10
2000-2200	22
2200-2400	35
2400-2600	64
2600-2800	133
2800-3000	187
>3000	4874
