distribute	reads
0-500	9088
500-800	5485
800-1000	3871
1000-1200	4129
1200-1400	4546
1400-1600	4860
1600-1800	6000
1800-2000	7842
2000-2200	10594
2200-2400	14416
2400-2600	19180
2600-2800	23992
2800-3000	28981
>3000	465379
