distribute	reads
0-500	29
500-800	5
800-1000	3
1000-1200	1
1200-1400	1
1400-1600	0
1600-1800	2
1800-2000	1
2000-2200	1
2200-2400	2
2400-2600	1
2600-2800	0
2800-3000	1
>3000	28
