distribute	reads
0-500	26268
500-800	13720
800-1000	6837
1000-1200	5656
1200-1400	4760
1400-1600	3897
1600-1800	3085
1800-2000	2765
2000-2200	2309
2200-2400	1970
2400-2600	1683
2600-2800	1442
2800-3000	1249
>3000	8583
