distribute	reads
0-500	1616
500-800	107
800-1000	29
1000-1200	14
1200-1400	18
1400-1600	8
1600-1800	5
1800-2000	3
2000-2200	0
2200-2400	1
2400-2600	0
2600-2800	0
2800-3000	2
>3000	10
