distribute	reads
0-500	6030
500-800	3490
800-1000	2054
1000-1200	1922
1200-1400	1868
1400-1600	1801
1600-1800	1676
1800-2000	1574
2000-2200	1585
2200-2400	1474
2400-2600	1326
2600-2800	1383
2800-3000	1191
>3000	28702
