This scatter plot visualizes the classic Iris dataset, showing the relationship between sepal length and sepal width for three iris species, with each species represented by a distinct color. Data is loaded from a tab-separated values file using `d3.tsv`, and the visualization is rendered as SVG circles using D3 v3. Linear scales (`d3.scale.linear`) map the quantitative axes, while `d3.svg.axis` generates the bottom and left axes with labels. A color legend identifies the species categories, and all points are drawn with a fixed radius of 3.5 pixels.