distribute	reads
0-500	2199
500-800	1567
800-1000	1187
1000-1200	1250
1200-1400	1640
1400-1600	2063
1600-1800	2731
1800-2000	3640
2000-2200	4954
2200-2400	6389
2400-2600	7627
2600-2800	8734
2800-3000	9335
>3000	59980
