{"version":"1.0","type":"rich","title":"Question 4: Multi-Series Chart (Bar + Line)","description":"This example combines a bar chart and line chart into a single multi-series visualization, showing revenue as blue bars and units sold as a red line for each product category. The data is loaded as CSV from a remote GitHub gist and aggregated by product using d3.csv and manual JavaScript object mapping. The chart uses d3.scaleBand for the categorical x-axis and two separate d3.scaleLinear scales for the revenue and units y-axes, with d3.axisLeft for gridlines and d3.line to generate the units-sold path. The SVG is rendered with a gradient background and includes hover transitions on bars and circles.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/ae8dc21bf98744c2bba7febde8d81cd3?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}