This example displays a correlation matrix for the Abalone dataset, showing pairwise Pearson correlation coefficients between eight physical measurements and age (rings). Each cell is a rectangle colored by its correlation value, with a diverging color scale from blue through white to red, emphasizing strong positive and negative relationships. The visualization is rendered as an SVG using D3 v4, with axes labeling variables on both the x- and y-axes. The correlation values are precomputed in the embedded data array rather than calculated on the fly, and the code relies on standard D3 scales and SVG elements to draw the matrix and its axes.