distribute	reads
0-500	7973
500-800	3354
800-1000	1679
1000-1200	1508
1200-1400	1386
1400-1600	1284
1600-1800	1219
1800-2000	1149
2000-2200	1421
2200-2400	1694
2400-2600	2133
2600-2800	2839
2800-3000	3701
>3000	46896
