distribute	reads
0-500	4810
500-800	12010
800-1000	9295
1000-1200	10568
1200-1400	12404
1400-1600	13619
1600-1800	13762
1800-2000	12937
2000-2200	11856
2200-2400	10971
2400-2600	9959
2600-2800	8828
2800-3000	8187
>3000	61330
