distribute	reads
0-500	0
500-800	0
800-1000	0
1000-1200	1
1200-1400	0
1400-1600	0
1600-1800	3
1800-2000	2
2000-2200	1
2200-2400	0
2400-2600	1
2600-2800	3
2800-3000	4
>3000	937
