Multi-Series Line Chart
This multi-series line chart visualizes daily average temperatures for New York, San Francisco, and Austin over a year, with three colored lines plotted against a time-based x-axis and a temperature y-axis. The visualization is built with D3 v3 and rendered as SVG, using conventional margins. It loads data from a TSV file via d3.tsv and leverages d3.time.format to parse dates, d3.time.scale for the x-position, d3.scale.linear for the y-position, and d3.scale.category10 for color encoding. Domains are computed with d3.extent, d3.min, and d3.max, while column names are derived using d3.keys. Axes are rendered with d3.svg.axis and the lines with d3.svg.line. The chart illustrates seasonal temperature variations across the three cities over a year, with each line distinguished by color.