distribute	reads
0-500	12187
500-800	6175
800-1000	3655
1000-1200	3249
1200-1400	2943
1400-1600	2850
1600-1800	2430
1800-2000	2137
2000-2200	2061
2200-2400	1939
2400-2600	1752
2600-2800	1683
2800-3000	1487
>3000	31401
