ARECIBO, PR - 249 Classic View
Energy and direction spectrum data
Wave data are plotted with frequency on the x axis and time on the y axis. The length of a vector corresponds to the energy density (with scale to the right of the plot) and the wavefront direction is in the direction of the arrow. True North is at the top of the page. Every fourth data run is plotted. Derived from a fast fourier transform of approximately 30 minutes of wave data.
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