distribute	reads
0-500	0
500-800	66
800-1000	16
1000-1200	6
1200-1400	2
1400-1600	8
1600-1800	0
1800-2000	1
2000-2200	0
2200-2400	1
2400-2600	1
2600-2800	0
2800-3000	0
>3000	3
