distribute	reads
0-500	8099
500-800	14403
800-1000	9163
1000-1200	8404
1200-1400	7096
1400-1600	6698
1600-1800	5770
1800-2000	5268
2000-2200	4771
2200-2400	4339
2400-2600	4022
2600-2800	3762
2800-3000	3235
>3000	44827
