distribute	reads
0-500	1658
500-800	129
800-1000	26
1000-1200	12
1200-1400	3
1400-1600	1
1600-1800	3
1800-2000	1
2000-2200	1
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	0
>3000	0
