My local D3
This example demonstrates the fundamentals of D3 version 3 for creating interactive SVG visualizations, starting with simple data binding and circle placement before progressing to a two-series line chart. The main visualization loads tabular data from a TSV file using `d3.tsv`, then applies linear scales (`d3.scaleLinear`) to map the x and y1/y2 columns to SVG coordinates. It renders two distinct line series using `d3.line` with step and natural curve interpolation, styled with purple and blue circles, and includes axis generation via `d3.axisTop`, `d3.axisRight`, and `d3.axisLeft`. The code also shows earlier iterations using `d3.select` and `d3.selectAll` for DOM manipulation.