This line chart displays one week of temperature data from cities worldwide, sourced from Data Canvas - Sense Your City. Each line represents a city, color-coded using `d3.scaleOrdinal` with `schemeCategory10`, and plotted over time with `d3.scaleTime` and `d3.scaleLinear`. The visualization uses `d3.line` with `curveBasis` for smooth curves, `d3.nest` to group data by city, and a custom `colorLegend` function rendered as SVG. Axes are created via `d3.axisBottom` and `d3.axisLeft`, with gridlines and a title, all styled through the SVG.