{"version":"1.0","type":"rich","title":"Selecting a Year on a Line Chart","description":"A line chart shows population over time for world regions, with a movable vertical line for selecting a specific year. Users drag the mouse across the chart, which updates the selected year and redraws the line. The visualization uses D3 v5 APIs including `scaleTime`, `scaleLinear`, `line`, `curveBasis`, `nest`, `axisLeft`, `axisBottom`, and `mouse`. Data comes from two CSV files (UN population estimates and medium variant) parsed with `timeParse`, and the chart renders as SVG with a color legend using `scaleOrdinal`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/00705e984d254aad9acefa3f5bec3e36?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}