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This example shows a scatterplot matrix for four traits of a biological species dataset, with each pair of traits plotted in a grid of small multiples. Users can brush a rectangular region in any cell to highlight the corresponding points across all other cells, while unselected points turn gray. The code uses d3.scale.linear, d3.svg.axis, d3.svg.brush, and d3.scale.category10 to render SVG circles colored by species, loading CSV data from a remote VizHub URL.