This example shows barley yield data for a single site, with each variety as a horizontal row of circles positioned by year, where circle radius encodes yield and color distinguishes barley genotypes. The chart is built with D3 v5 using nested data from a CSV file, rendered as SVG. It employs `d3.nest()` for grouping, `d3.scalePoint` for the y-axis, `d3.scaleLinear` for years, and `d3.scaleOrdinal` with the `schemeAccent` color palette, alongside `d3.axisLeft` and `d3.axisBottom` for axes.