A line chart visualizes temperature readings in San Francisco over a single week, with time on the x-axis and temperature on the y-axis. The chart displays a smooth curve through the data points using a basis spline, and includes labeled axes, grid lines, and a title. The visualization is built with D3 v6, using `scaleTime`, `scaleLinear`, `line`, and `curveBasis`, and renders as an SVG. Data is loaded from a CSV file hosted on VizHub, parsed with `csv()`, and transformed into JavaScript Date and numeric values.