This example displays temperature readings from multiple cities over a week, with each city represented by a colored line and a corresponding legend. The chart uses d3.scaleTime, d3.scaleLinear, and d3.scaleOrdinal to map time, temperature, and city names, while d3.line with curveBasis smooths the paths. Data is loaded via d3.csv from an external dataset, and the SVG is rendered with axes, grid lines, and labels styled through CSS.