distribute	reads
0-500	8702
500-800	5348
800-1000	3268
1000-1200	3152
1200-1400	2986
1400-1600	2819
1600-1800	2650
1800-2000	2478
2000-2200	2372
2200-2400	2295
2400-2600	2090
2600-2800	2079
2800-3000	1921
>3000	42055
