distribute	reads
0-500	2170
500-800	5
800-1000	1
1000-1200	2
1200-1400	1
1400-1600	2
1600-1800	1
1800-2000	0
2000-2200	0
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	0
>3000	2
