BarChart
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A bar chart displays alpha power values from a node labeled F3 across successive epochs, with each bar’s length encoding the numeric value and its vertical position mapping to the epoch index. The visualization uses D3 v6 APIs including `scaleLinear`, `scaleBand`, `axisLeft`, `axisBottom`, and `csv` to load and parse the dataset. Bars are rendered as SVG rectangles with a steelblue fill, while the chart includes axis labels and a title. The code parses all numeric columns from a CSV file before rendering.
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