distribute	reads
0-500	8955
500-800	5792
800-1000	3427
1000-1200	3527
1200-1400	4003
1400-1600	4881
1600-1800	6417
1800-2000	9284
2000-2200	14010
2200-2400	20686
2400-2600	29827
2600-2800	40304
2800-3000	51236
>3000	1088765
