{"version":"1.0","type":"rich","title":"Melting Data form Multiple Lines","description":"This chart shows population trends over time for global regions, with each region drawn as a colored line across a time axis from 1950 to 2100. The data is sourced from UN population estimates and medium variant projections, melted into a tidy format. Using d3.nest, the data is grouped by region and sorted by the final population value, then rendered with d3.line and curveBasis. A d3.scaleOrdinal assigns categorical colors, and a custom colorLegend displays the region labels. Gridlines, axis labels, and a title provide context.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/5d136fe443d24c4aa535dc9f73a66da1?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}