distribute	reads
0-500	10705
500-800	9737
800-1000	4245
1000-1200	3370
1200-1400	2828
1400-1600	2448
1600-1800	2198
1800-2000	2094
2000-2200	1959
2200-2400	1832
2400-2600	1771
2600-2800	1768
2800-3000	1668
>3000	35243
