distribute	reads
0-500	0
500-800	0
800-1000	0
1000-1200	0
1200-1400	0
1400-1600	0
1600-1800	0
1800-2000	0
2000-2200	6055
2200-2400	6050
2400-2600	6119
2600-2800	6171
2800-3000	6076
>3000	968898
