Line Chart with Multiple Lines
This line chart displays one week of temperature data in degrees Celsius for cities worldwide, sourced from Data Canvas - Sense Your City. Each line represents a city, with time on the x-axis and temperature on the y-axis, using a basis curve for smooth paths and a color legend to identify cities. The visualization is built with D3 v5, rendering as SVG, and uses `d3.scaleTime`, `d3.scaleLinear`, `d3.scaleOrdinal`, `d3.line`, `d3.nest`, and `d3.schemeCategory10` for color mapping. Gridlines and axis labels provide context, while paths are styled with mix-blend-mode for overlapping lines.