This line chart displays one week of temperature data from cities worldwide, sourced from the Data Canvas - Sense Your City project. Using d3.csv to load data and d3.nest to group by city, the visualization renders multiple temperature trends over time with d3.line, applying a curved basis interpolation. The chart includes custom axes with d3.axisLeft and d3.axisBottom, a categorical color scale using d3.scaleOrdinal with schemeCategory10, and a legend generated from a separate colorLegend function. The SVG output features semi-transparent lines with mix-blend-mode for overlapping clarity.