A multi-line chart displays daily temperature readings for New York, San Francisco, and Austin, with each city’s time series drawn as a smooth, colored path. The visualization uses d3.tsv to load the data, d3.scaleTime and d3.scaleLinear for positioning, and d3.line with curveBasis for the paths. Interactive labels trigger hover and click handlers that highlight or toggle the visibility of each city’s line using d3 selection styling. A d3.zoom behavior is applied to the SVG, though its zoom event handler remains empty.