20 6
50 6
80 4.8
160 0.4
200 0.0
320 -0.15
640 -0.7
1280 -1.20
2560 -1.6
3000 -1.9
4000	-3.1
5000	-3.75
7000	-4.4
10000	-5
20000	-5.6