This scatter plot visualizes the relationship between free sulfur dioxide and total sulfur dioxide in red wine samples from the UCI Machine Learning Repository’s Wine Quality dataset. The visualization uses D3 v5’s `scaleLinear`, `axisBottom`, and `axisLeft` APIs to render axes with gridlines and red circles as data points. The SVG chart is generated from a CSV file loaded via `d3.csv`, with axes labeled “density” and “pH,” though the title indicates horsepower versus weight. Data fields are converted to numeric values before rendering.