distribute	reads
0-500	1480
500-800	958
800-1000	741
1000-1200	891
1200-1400	1129
1400-1600	1546
1600-1800	2068
1800-2000	2408
2000-2200	2633
2200-2400	2270
2400-2600	1891
2600-2800	1552
2800-3000	1238
>3000	5136
