distribute	reads
0-500	153158
500-800	215739
800-1000	149610
1000-1200	149975
1200-1400	149525
1400-1600	145831
1600-1800	144457
1800-2000	142559
2000-2200	139495
2200-2400	136977
2400-2600	134646
2600-2800	130384
2800-3000	125345
>3000	3086020
