This scatter plot matrix compares all numeric fields in the iris dataset, with each cell showing a bivariate relationship and points colored by species using d3.scaleOrdinal and a custom color array. The four-by-four grid is built with D3 v6, rendering each plot as an SVG with axes from d3.axisLeft and d3.axisBottom, and labels placed on the diagonal. Data is loaded from a CSV via d3.csv, while d3.extent sets the scales.