distribute	reads
0-500	2117
500-800	1947
800-1000	1822
1000-1200	2320
1200-1400	2349
1400-1600	2064
1600-1800	1842
1800-2000	1948
2000-2200	1957
2200-2400	2372
2400-2600	2643
2600-2800	3099
2800-3000	3487
>3000	41108
