{"version":"1.0","type":"rich","title":"Temperature in multiple cities","description":"This visualization displays population trends over time for multiple cities, with each colored line representing a different region. A vertical black line marks the currently selected year, and moving the mouse across the chart updates this selection and re-renders the view. The code uses D3 v5 APIs including `nest()`, `scaleTime()`, `scaleOrdinal()`, `line()` with `curveBasis`, and axis generators. Data comes from the UN population estimates CSV files, processed by melting wide-format years into tidy rows, and rendered as SVG paths with a categorical color legend.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/9819751a19ba40d8b6b5003617b6fee2?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}