This heatmap overlays eye-tracking fixation points on a static map of Antwerp’s metro system, with each point’s position derived from `MappedFixationPointX` and `MappedFixationPointY` coordinates in `data.csv`. Using React and D3’s `scaleLinear` for coordinate mapping, the visualization renders an SVG containing the fixation data. The background image is applied via CSS, while the SVG is sized at 960×500 pixels. The code loads CSV data asynchronously with `d3.csv`, converting numeric fields before passing them to the render function, though no explicit heatmap aggregation or density calculation is visible in the provided source.