This line chart displays a week of temperature data (in degrees Celsius) for cities worldwide, sourced from Data Canvas - Sense Your City. It uses D3 v5 to render an SVG visualization, with the `scaleTime` and `scaleLinear` functions mapping timestamps and temperatures to axes. The chart includes multiple smoothed lines (`line` with `curveBasis`) colored by city via a `scaleOrdinal` color scale, a legend built with a custom `colorLegend` function, and grid lines generated by `axisBottom` and `axisLeft`.