distribute	reads
0-500	3880
500-800	2895
800-1000	1976
1000-1200	2314
1200-1400	3019
1400-1600	4388
1600-1800	6813
1800-2000	10140
2000-2200	14138
2200-2400	18626
2400-2600	22882
2600-2800	26739
2800-3000	28354
>3000	229116
