This line chart maps ordinal letter categories (a–m) from a CSV file to their corresponding numeric values. The visualization uses D3 v5’s `scalePoint` for the x-axis and `scaleLinear` for the y-axis, rendering a smooth curve via `line()` with `curveBasis`. Circles mark each data point, while axes are generated with `axisBottom` and `axisLeft`. The SVG output includes a black stroked path and teal circular markers, with data loaded asynchronously through `csv()`.