distribute	reads
0-500	17
500-800	7
800-1000	0
1000-1200	4
1200-1400	5
1400-1600	4
1600-1800	1
1800-2000	9
2000-2200	13
2200-2400	10
2400-2600	11
2600-2800	9
2800-3000	7
>3000	65
