This scatter plot visualizes the correlation between horsepower, miles per gallon (mpg), and engine displacement for cars from the UCI Machine Learning Repository’s Auto MPG data set. It shows each car as a circle, with the x-axis representing horsepower, the y-axis representing mpg, and the circle radius encoding displacement. The visualization uses D3 v5’s `scaleLinear`, `scaleSqrt`, `axisLeft`, `axisBottom`, and `csv` to load and render the data as SVG circles with a custom size legend.