distribute	reads
0-500	5871
500-800	1967
800-1000	983
1000-1200	868
1200-1400	799
1400-1600	726
1600-1800	667
1800-2000	700
2000-2200	852
2200-2400	1879
2400-2600	1922
2600-2800	1393
2800-3000	2963
>3000	24149
