All of the data for the 43-day interval of Leg 200 can be summarized in spectrogram displays of the amplitude of the spectra as a function of time. Power spectral density was computed for window lengths of 1,048,576 points (~1.82 hr). Within each window, fast Fourier transforms (ffts) were computed over 262,144 point intervals, with 75% overlap and Hanning tapers. Welch averaging was used to compute the power spectral densities from the 13 ffts. The spectrograms for all six channels are shown in Figures F6, F7, F8, F9, F10, and F11. Spectral amplitudes have been doubled to allow for the power in the negative frequencies.