This multi-series line chart displays daily average temperatures for New York, San Francisco, and Austin from October 2011 to April 2012. A Voronoi diagram, computed using the `d3.voronoi` API with `d3.voronoi.v1`, overlays the plot to enhance interactivity. Users can hover over cells to highlight the corresponding city’s line and click to toggle its visibility. The visualization is rendered as an SVG using the D3 v7 library, with axes and curves generated via `d3.axisBottom`, `d3.axisLeft`, and `d3.line`. A checkbox labeled “Show Voronoi” is present but disabled. Data is loaded from a tab-separated file using `d3.tsv`, and city lines are color-coded using `d3.schemeCategory10`.