This line chart displays depression rates by region over time, using temperature data from the Data Canvas - Sense Your City project. The visualization renders SVG paths with d3.line and curveBasis for smooth curves, while d3.scaleTime and d3.scaleLinear handle the axes. Colors are assigned via d3.scaleOrdinal with schemeCategory10, and a custom colorLegend component shows the region key. Data is loaded through React’s useEffect hook and processed with d3.csv.