distribute	reads
0-500	88164
500-800	8997
800-1000	693
1000-1200	157
1200-1400	43
1400-1600	12
1600-1800	1
1800-2000	1
2000-2200	1
2200-2400	0
2400-2600	0
2600-2800	0
2800-3000	0
>3000	0
