This example visualizes weekly temperature variations in San Francisco using a smooth, natural curve with circular data points. The SVG chart displays temperature on the y-axis and time on the x-axis, with tick marks formatted to show abbreviated weekday names. Built with React and D3 v5, it uses `scaleTime`, `scaleLinear`, `extent`, and `line().curve(curveNatural)` to construct the visualization. Data is loaded asynchronously from a remote CSV file via `d3.csv`, while React state manages the loading process.