distribute	reads
0-500	28
500-800	17
800-1000	12
1000-1200	7
1200-1400	4
1400-1600	3
1600-1800	1
1800-2000	0
2000-2200	1
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	0
>3000	0
