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Amplitude spectrum of f(t) – the left column, histogram and its Gaussian approximation (the red line) – the right column, for Austria, Switzerland and South Korea (top to bottom). Distribution parameters of f(t) for Austria: standard deviation 125, skewness 0.6, kurtosis 1.5; Switzerland: standard deviation 220, skewness 0.9, kurtosis 2.6; South Korea: standard deviation 61, skewness 0.2, kurtosis 2.5.
