distribute	reads
0-500	2035
500-800	1836
800-1000	1566
1000-1200	2084
1200-1400	2644
1400-1600	3737
1600-1800	5417
1800-2000	7075
2000-2200	9266
2200-2400	11310
2400-2600	13092
2600-2800	13744
2800-3000	14039
>3000	58070
