This heatmap visualizes brand-related data for 20 companies, using a 3-color continuous scale from d3.scaleLinear that pivots at a value of 5 and rounds scores to 0.2 increments, creating 10 distinct color bands. Each SVG rectangle represents a company, colored by its relative score, with the ticker symbol and score overlaid. The code uses d3.json to load data from a NASDAQ-linked gist, d3.scaleLinear for color mapping, and d3.mouse for tooltip interactions. A color legend at the bottom displays the full gradient range from 0 to 10.