{"version":"1.0","type":"rich","title":"Selecting a Year on a Line Chart","description":"This line chart displays global population trends for regions from 1950 to 2100, with a movable vertical line that lets the user select a specific year. The chart highlights population values for that chosen year via circles on each regional line, with a color legend identifying each region. Built with D3 v5, the visualization uses `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` with `curveBasis` to render the SVG chart. Data comes from UN population estimates and medium variant projections, loaded via `csv` and processed through `nest` and `melt` functions. Hover interactions are handled by the `mouse` callback on an invisible rectangle.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/02d22060151d4d4996cfaca885545449?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}