A line and scatter plot shows temperature readings in Celsius over a week in San Francisco, using a time-based x-axis and linear y-axis. React components render SVG elements, while D3 v5 scales, extents, and the `timeFormat` API handle data mapping and tick labeling. The chart loads comma-separated data from a remote GitHub gist, displays native tooltips via SVG `title` elements, and colors marks with teal strokes and fills.