distribute	reads
0-500	9195
500-800	26675
800-1000	17377
1000-1200	14907
1200-1400	13646
1400-1600	11984
1600-1800	10775
1800-2000	9690
2000-2200	8776
2200-2400	7969
2400-2600	7365
2600-2800	6868
2800-3000	6141
>3000	84164
