{"version":"1.0","type":"rich","title":"Melting Data for multiple lines | selecting a Year","description":"This visualization displays population trends for countries from 1950 to 2100 as multiple smoothed lines, with a vertical line marking the currently selected year. Clicking a legend item or a path isolates that country’s data, while the legend updates to show the population for the chosen year. Built with D3 v5, it uses `d3.nest()`, `d3.line()`, and `curveBasis` to generate paths, with data loaded from UN population estimate CSV files via `d3.dsv()`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/0a0b41436b30463c9a89d795e88aba85?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}