This example visualizes the distribution of probability estimates from eight verbal uncertainty phrases (such as “Almost Certainly” and “Almost No Chance”) using kernel density estimation. Each smoothed density curve is colored with a viridis scale based on the group mean, revealing differences in central tendency and spread across categories. The visualization uses D3 v4 to load CSV data from GitHub, compute the means, and render the densities as SVG paths. The kernel density estimator applies an Epanechnikov kernel, while axes, gridlines, and labels are drawn with `d3.axisBottom`, `d3.axisLeft`, and the `d3.scaleSequential` with `d3.interpolateViridis`.