distribute	reads
0-500	65009
500-800	72384
800-1000	38769
1000-1200	33695
1200-1400	28772
1400-1600	23725
1600-1800	20251
1800-2000	17441
2000-2200	15834
2200-2400	14122
2400-2600	12828
2600-2800	11790
2800-3000	10558
>3000	196753
