Three side-by-side correlation matrices visualize relationships among eight physical measurements of abalone, split by sex into male, female, and infant groups. Each grid cell is colored with a sequential rainbow scale from −1 to 1, revealing how measurement correlations differ across the three categories. The code uses `d3.scaleBand` for axes, `d3.scaleSequential` with `d3.interpolateRainbow` for color, and `jz.arr.correlationMatrix` plus `data2grid.grid` to compute and arrange the correlations. Data comes from a CSV file of abalone measurements rendered as SVG rects.