This heatmap uses a red-to-grey-to-green gradient to visualize relevance scores for companies, with the color scale’s domain rounded to the nearest 0.2 to create 50 discrete color bins. A legend beneath the grid maps scores from 0 to 10, using a neutral grey midpoint for smoother transitions. The visualization renders company symbols and their scores as SVG tiles, generated with D3's `scaleLinear` and `.join()` operators, pulling JSON data from a GitHub gist. Tooltips and click interactions expose additional company details.