distribute	reads
0-500	575
500-800	2246
800-1000	2127
1000-1200	2667
1200-1400	2849
1400-1600	2953
1600-1800	3075
1800-2000	2902
2000-2200	3038
2200-2400	2864
2400-2600	2912
2600-2800	2924
2800-3000	2973
>3000	85625
