FIG. 4. Two-dimensional histograms describing the positional dependency of the nearest neighbors of an individual tuna, plotted as a function of NND in body lengths and NNRB in degrees. The first column represents the closest near neighbor, the second column represents the next closest near neighbor, and so on. The top row shows the raw histograms, and the bottom row shows low-pass filtered versions of the histograms. Color represents the amplitude of the pdf with red being the highest and blue being the lowest, ranging from 0 to 0.008 deg 1m 1 in the top row and 0 to 0.005 deg 1m 1 in the bottom row.
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