distribute	reads
0-500	204516
500-800	10543
800-1000	579
1000-1200	110
1200-1400	24
1400-1600	6
1600-1800	2
1800-2000	2
2000-2200	0
2200-2400	0
2400-2600	1
2600-2800	0
2800-3000	0
>3000	2
