This 3D scatter plot visualizes BMW car data, showing two separate marker series that plot model, price, and mileage for one trace, and model, price, and engine size for another. The first trace uses default marker styling with opacity, while the second uses gray markers with circle symbols. Both are rendered using Plotly’s `scatter3d` type via `Plotly.newPlot`. The data is loaded asynchronously with `d3.csv` from a GitHub-hosted CSV file.