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This example shows a radial stacked bar chart of US state population data broken down by seven age groups, using a circular layout with labeled segments and a legend. The visualization is rendered in SVG using D3 v5, with a `d3.scaleBand` for angular positioning and the `d3-scale-radial` library for radial scales. Data is loaded from a CSV file via `d3.csv`, and the stacked bars are generated with `d3.stack` and `d3.arc`. The chart includes circular gridlines, state labels, and a color-coded legend.
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