distribute	reads
0-500	1586
500-800	1066
800-1000	939
1000-1200	1512
1200-1400	2455
1400-1600	3857
1600-1800	5653
1800-2000	8343
2000-2200	11414
2200-2400	14001
2400-2600	16223
2600-2800	17272
2800-3000	18945
>3000	155684
