distribute	reads
0-500	9940
500-800	195
800-1000	20
1000-1200	15
1200-1400	3
1400-1600	5
1600-1800	2
1800-2000	0
2000-2200	0
2200-2400	0
2400-2600	0
2600-2800	1
2800-3000	0
>3000	0
