distribute	reads
0-500	4859
500-800	3987
800-1000	2544
1000-1200	2765
1200-1400	3244
1400-1600	3923
1600-1800	4982
1800-2000	6436
2000-2200	8714
2200-2400	11940
2400-2600	16060
2600-2800	20615
2800-3000	25501
>3000	403683
