distribute	reads
0-500	113050
500-800	3707
800-1000	209
1000-1200	41
1200-1400	10
1400-1600	4
1600-1800	0
1800-2000	1
2000-2200	0
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	1
>3000	1
