This line chart displays one week of temperature readings from cities worldwide, using data from Data Canvas - Sense Your City. Each city appears as a smooth, semi-transparent colored line that traces temperature changes over time. The visualization includes a color legend, axis labels, and a title. Built with D3 v5, the code uses `d3.line` with `curveBasis`, `d3.nest` for grouping by city, and `d3.scaleTime` and `d3.scaleLinear` for the axes.