This visualization compares four area-chart layouts for multivariate stock data, showing the same series as stacked, centered, and separated regions to highlight alternative encodings of cumulative change. It loads CSV data via `d3.text` and `d3.dsvFormat`, parses dates with `d3.timeParse`, and uses `d3.nest()` to group by symbol. SVG rendering employs `d3.area()` with `d3.curveBasis` for each variant, while scales and axes come from `d3.scaleTime`, `d3.scaleLinear`, and `d3.axisBottom`. Animated transitions between layouts are driven by D3’s update pattern, though the code excerpts omit the final animation calls.