{"version":"1.0","type":"rich","title":"Melting Data Multiple Lines","description":"The visualization shows population over time by region as multiple smoothed lines, with a color legend and axis labels. It uses D3 v5 APIs including `nest()` for grouping, `line()` with `curveBasis` for path generation, `scaleTime` and `scaleLinear` for axes, and `scaleOrdinal` with `schemeCategory10` for colors. Data is melted from UN population estimates and medium variant CSV files, spanning 1950 to 2100, rendered as SVG paths with multiply blend modes.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/4dee4f4e93d7481f8356dab801a9bcbb?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}