This example shows a multi-series line chart comparing daily average temperatures in New York, San Francisco, and Austin over a period of several months. The visualization uses D3 v7 with SVG rendering to draw three smooth lines, one per city, with interactive features that dim unrelated lines on hover and allow users to toggle each city’s visibility by clicking its legend label. Zooming is supported via `d3.zoom` with a time-scaled x-axis, and the line geometry is generated using `d3.line` with `curveBasis`. Data is loaded from a TSV file.