1 2 3 4 5 6 7 8 9 10 11 12 13 14
freq,spl 20,85.0 50,82.0 70,75.0 80,55.0 90,70.0 100,80.0 200,85.0 500,83.0 1000,82.0 2000,80.0 5000,78.0 10000,75.0 20000,72.0