distribute	reads
0-500	62267
500-800	3439
800-1000	321
1000-1200	105
1200-1400	25
1400-1600	11
1600-1800	3
1800-2000	2
2000-2200	0
2200-2400	1
2400-2600	0
2600-2800	0
2800-3000	1
>3000	0
