distribute	reads
0-500	0
500-800	1013
800-1000	222
1000-1200	92
1200-1400	36
1400-1600	31
1600-1800	12
1800-2000	12
2000-2200	16
2200-2400	16
2400-2600	4
2600-2800	7
2800-3000	8
>3000	40
