A line chart displays weekly averaged measurements from the Lesedi and meter telescopes between 2000 and 2010. D3.js selects SVG elements, applies time and linear scales, and renders paths with curved interpolation. A nested dataset groups values by telescope, with a custom color legend component. Axis ticks extend across the chart as gridlines, and the y-axis includes a domain without explicit removal. The visualization demonstrates reusable D3 modules, including `scaleTime`, `scaleOrdinal`, `line`, and `nest`.