{"version":"1.0","type":"rich","title":"D3 Course 4: Area Chart","description":"This area chart displays population trends over time using a smooth curve. The visualization loads CSV data, maps the year field to a time scale, and the population values to a linear scale. Built with D3 v5, the chart uses `d3.area()` with `curveBasis` to generate the filled SVG path, alongside `d3.axisBottom` and `d3.axisLeft` for labeled axes. The y-axis ticks are formatted with `d3.format` to abbreviate large numbers, and the chart includes gridlines and a descriptive title.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/022d9888c92a47f08d877a1fb2d7f8fa?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}