distribute	reads
0-500	16
500-800	1
800-1000	1
1000-1200	1
1200-1400	0
1400-1600	0
1600-1800	1
1800-2000	0
2000-2200	0
2200-2400	1
2400-2600	4
2600-2800	1
2800-3000	1
>3000	48
