{"version":"1.0","type":"rich","title":"Melting Data and Selecting a Year for Multiple Lines","description":"This visualization shows world population projections for different development regions from 1950 to 2100, with selectable time points. A vertical line marks the currently chosen year, and hovering over the chart updates it, redrawing the multi-line display. The code uses D3 v5 for data binding, scales, axes, and the line generator, with `nest()` to group data by region and `scaleOrdinal` for color assignment. Data comes from the UCI Machine Learning Repository's Auto MPG dataset, which is melted from wide to long format using custom parsing logic.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/0b09780564bb4ea49115019320b858e9?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}