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This example visualizes eye-tracking data as a multi-line chart, plotting fixation index on the x-axis and mapped fixation point Y on the y-axis. The size of each point reflects fixation duration, with gray-scale squares or colored circles representing the data. Built with React and D3, it renders an SVG with axes, steel-blue paths for each series, and a hover interaction. The data comes from a structured timeline, and the code uses D3’s selection, join, and axis components to generate the visualization.