This example displays a one-week temperature trend for San Francisco as a smooth area chart, using an SVG rendering with D3 v5. The visualization maps timestamps to a time scale on the x-axis and temperature values to a linear scale on the y-axis, with an area generator using a basis curve for smoothing. Axis labels and a title are included, and the chart applies a maroon fill with opacity. The data, loaded from a CSV via `d3.csv`, comes from Gray Area’s "Sense Your City" initiative, while the code also imports utility modules for car data processing.