This area chart visualizes a week of temperature data in San Francisco, using a smooth curve to show the trend over time. The chart is rendered as an SVG, with time on the x-axis and temperature on the y-axis, both scaled using `d3.scaleTime` and `d3.scaleLinear`. The data is loaded from a CSV file, and the area fill is generated with `d3.area` and `d3.curveBasis`. Axes are created using `d3.axisBottom` and `d3.axisLeft`.