distribute	reads
0-500	38606
500-800	23421
800-1000	13167
1000-1200	11890
1200-1400	10872
1400-1600	9915
1600-1800	9049
1800-2000	8280
2000-2200	7871
2200-2400	7600
2400-2600	6780
2600-2800	6591
2800-3000	5745
>3000	100322
