distribute	reads
0-500	44666
500-800	27719
800-1000	16127
1000-1200	14693
1200-1400	13279
1400-1600	12450
1600-1800	11114
1800-2000	10225
2000-2200	9340
2200-2400	8681
2400-2600	7855
2600-2800	7464
2800-3000	6920
>3000	90302
