A dual-axis line chart compares daily COVID-19 case counts against agricultural yield over time for the Indian state of Uttarakhand. The chart uses red and blue lines with corresponding left and right axes, and a legend to distinguish the metrics. It is built with D3 v6, using `d3.scaleTime`, `d3.scaleLinear`, `d3.line`, and `d3.axisBottom`/`d3.axisLeft`/`d3.axisRight` to render SVG axes and paths. Data is loaded as CSV from a gist, with date parsing and numeric conversion performed inline.