This area chart visualizes one week of temperature data in San Francisco, with temperature on the y-axis and time on the x-axis. The chart uses a smooth curve to fill the area beneath the temperature line, colored maroon, against a clean background with labeled axes and a prominent title. The code loads CSV data via `d3.csv`, scales time and linear values with `d3.scaleTime` and `d3.scaleLinear`, and renders the area using `d3.area` with `d3.curveBasis`. Axes are drawn with `d3.axisBottom` and `d3.axisLeft` in SVG.