Wiki
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This visualization displays a hierarchical tree of Russian Wikipedia science categories, using node color to encode a numerical group value from the dataset. The D3 v5 code applies a tree layout with horizontal links, scaling node positions via the `x` and `y` accessors, and renders circles and text labels in SVG. A linear color scale maps the group values from white to purple, while zooming is enabled through `d3.zoom()`. A legend shows the mapping for the two extreme group values.
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