This heatmap displays 20 company symbols arranged in a 5-column grid, with each cell colored by a relative score on a continuous d3.scaleLinear gradient from gray-green to dark teal. Scores are rounded to the nearest 0.3 unit using a custom rounding function, and a 10-step color legend is rendered beneath the grid. Built with D3 v7, the visualization reads JSON data from a GitHub gist, uses SVG rectangles and text for rendering, and includes interactive tooltips on mouseover that show company details alongside a fixed information panel.