distribute	reads
0-500	14266
500-800	115
800-1000	17
1000-1200	5
1200-1400	6
1400-1600	3
1600-1800	4
1800-2000	0
2000-2200	1
2200-2400	1
2400-2600	0
2600-2800	1
2800-3000	0
>3000	5
