This example visualizes population projections for global regions from 1950 to 2100 as multiple smoothed lines, each colored by region via an ordinal color scale and accompanied by a legend. The chart uses d3.scaleTime, d3.scaleLinear, d3.axisLeft, and d3.axisBottom to render axes, while d3.line with d3.curveBasis draws the paths. Data is loaded from CSV files and melted into a tidy format before rendering as SVG.