This example displays two overlapping scatter plots of the Iris dataset, using petal length and width on the axes while also encoding sepal length and width as non-standard `rx` and `ry` attributes on each circle. The visualization renders as an SVG using D3 v6, with data loaded via `d3.csv` and scales from `d3.scaleLinear`. Axes are drawn with `d3.axisLeft` and `d3.axisBottom`, while species are color-coded through a custom marker function.