The amplitude is the signal height.

(FT) The Fourier transformation is a mathematical procedure to separate out the frequency components of a signal from its amplitudes as a function of time, or the inverse Fourier transformation (IFT) calculates the time domain from the frequency domain. Fourier transformation analysis allows spatial information to be reconstructed from the raw data.

The distribution associated with the magnitude of the noise amplitude following a Gaussian distribution. The mean value of this distribution is roughly 1.25 s0, where s0 is the standard deviation of the original Gaussian distribution.