distribute	reads
0-500	1566
500-800	2729
800-1000	2650
1000-1200	3467
1200-1400	3695
1400-1600	3556
1600-1800	3319
1800-2000	3216
2000-2200	2919
2200-2400	2851
2400-2600	2716
2600-2800	2790
2800-3000	2681
>3000	56485
