{"version":"1.0","type":"rich","title":"Selecting a Year on a Line Chart","description":"This line chart displays population trends over time for global regions, using United Nations population estimates from 1950 to 2100. A movable vertical line marks the currently selected year, and moving the mouse across the chart updates the selection to the nearest year, re-rendering the visualization. The chart uses d3.line with curveBasis for smooth paths, d3.scaleTime and d3.scaleLinear for axes, and d3.nest to group data by region. A separate color legend identifies each region, with SVG rendering and d3.mouse handling for interaction.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/6cab57233ec44c76973f5c9be3808c19?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}