The Fast Fourier Transformation (FFT) can be applied to a marked region, the data displayed on the screen, over a larger time
range in the data between two markers, over marked epochs, or the whole EEG, in order to examine the frequency content of a
signal. Results of the FFT can be viewed in a variety of ways, including amplitude and power spectra, amplitude and power in
frequency bands, and these results may be printed or written to data files in ASCII format. The previously calculated FFT spectrum
may be redisplayed. The current FFT can be saved to a binary file and reloaded. Topographic maps of amplitude, power, and
phase can be plotted.