{"version":"1.0","type":"rich","title":"Selecting a Year on a Line Chart","description":"This visualization shows UN population estimates and projections from 1950 to 2100 for world regions as multi-line charts, with a movable vertical line that selects a year. Moving the mouse across the chart updates the selected year, which is rendered as a black vertical line. The chart uses D3 v5 with SVG rendering, employing `d3.line` with `curveBasis` for smooth paths, `d3.nest` to group data by region, and `d3.scaleTime` and `d3.scaleLinear` for axes. A custom color legend maps regions using `d3.scaleOrdinal` with `schemeCategory10`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/14f76c871b844e14a3b709504ef038de?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}