This multi-series line chart displays daily temperature readings for New York, San Francisco, and Austin over several months, with each city drawn as a distinct colored line. Users can toggle cities on and off by clicking legend entries, and hovering over a line highlights it while dimming others. The chart uses D3 v3 with SVG rendering, employing d3.svg.line, d3.time.scale, and d3.behavior.zoom for panning/zooming. Temperature data comes from a tab-separated data.tsv file, with axes labeled in degrees Fahrenheit.