distribute	reads
0-500	82371
500-800	6233
800-1000	345
1000-1200	61
1200-1400	20
1400-1600	8
1600-1800	1
1800-2000	1
2000-2200	0
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	1
>3000	1
