Optimum frequency test. Z J N f A 1 128 15 0 9 0 0 0 0 0 0 0 0 1498.5 -1500 0 0 1 0 15 1500 -1490 0 0 1 0 25 1490 -1485 0 0 1 0 35 1485 -1482 0 0 1 0 50 1482 -1480 0 0 1 0 70 1480 0 0 0 1 0 100 1600 400 0.5 1.0 1.8 0 120 1800 600 0.1 0.2 2.0 0 90 2.5 97.5 20 10 300 1E8 -1 1 1000 0 20.0 20 5.0 40 100 3 300 2100 12 300 0 140 12 20