{"version":"1.0","type":"rich","title":"Melting data for multiple lines","description":"This example displays population trends over time for multiple world regions as overlapping curved lines, with a color legend identifying each region and a vertical marker highlighting the year 2018. The visualization uses D3 v5’s `nest()` to group data by region, `scaleTime` and `scaleLinear` for axes, and `line` with `curveBasis` to generate smooth paths. Data is loaded from CSV files via `csv()` and melted from wide to long format, while `axisBottom` and `axisLeft` render the grid and labels.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/13f28e6eb9244d13bd05f2dfcc72df5a?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}