{"version":"1.0","type":"rich","title":"Fork of Fork of Selecting a Year on a Line Chart","description":"This interactive line chart shows United Nations population estimates and projections for world regions from 1950 to 2100. Users can move the mouse across the chart to select a year, triggering a vertical line to update and re-render the visualization. Built with D3 v5, the code uses `d3.nest` to group data by region, `d3.line` with `curveBasis` for smoothed paths, and scales like `scaleTime` and `scaleLinear`. The data is loaded from two CSV files via `d3.csv` and processed with custom melting logic.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/bab25be5eda744719f1a310b7b33a9fe?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}