This example visualizes temperature fluctuations in San Francisco over a week using a line chart rendered as an SVG. The chart highlights the area beneath the temperature curve, with axes labeled for time and temperature. Built with React and D3, it uses `scaleTime`, `scaleLinear`, `area`, and `axisBottom`/`axisLeft` to map and draw the data, which is loaded from a CSV file via `d3.csv`. The visualization employs a maroon filled area to emphasize the temperature pattern across the week.