This example presents a scatter plot of an insurance dataset, visualizing the relationship between patient height and age while encoding weight and income through non-standard circle radius properties (`rx` and `ry`), which distorts the marks into ellipses. The code colors each point by gender (red for female, green for male) and builds the SVG chart using D3 v5 APIs such as `csv`, `scaleLinear`, `extent`, `axisLeft`, and `axisBottom`. Data is loaded from a GitHub-hosted CSV file, with axes labeled “Charges” and “bmi” despite the actual mapped fields being age and height.