A line chart displays temperature readings over a week, with time on the horizontal axis and temperature on the vertical axis. The visualization uses React to render SVG elements, with D3’s `scaleTime` and `scaleLinear` for scaling, `line` with `curveNatural` for the smoothed path, and `extent` to compute domains. Data comes from a CSV of San Francisco temperatures. Axis components generate ticks using `xScale.ticks()` and `yScale.ticks()`.