distribute	reads
0-500	1680
500-800	2002
800-1000	1712
1000-1200	2246
1200-1400	3132
1400-1600	4645
1600-1800	6661
1800-2000	8202
2000-2200	7773
2200-2400	6195
2400-2600	4709
2600-2800	3624
2800-3000	2928
>3000	9985
