{"version":"1.0","type":"rich","title":"Melting Data for Multiple Lines","description":"This example shows world population projections from 1950 to 2100 as multiple smoothed lines, with a vertical line marking the currently selected year. The chart uses a color legend to distinguish regions, and hovering over the chart updates the selected year. It uses `d3.nest()` to group data, `d3.line()` with `curveBasis` for path generation, and `d3.scaleTime`/`d3.scaleLinear` for axes. The data is melted from CSV files, and the view is rendered as an SVG.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/c0fca4d258ca4e9f849a9b31a8010afd?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}