First Bar Chart
This bar chart displays quarterly user counts in thousands, with green bars representing actual values and a red hover state highlighting interactive selection. The visualization uses d3.csv to load data from a local CSV file, then renders SVG rectangles scaled by d3.scaleBand for the x-axis and d3.scaleLinear for the y-axis, with axes generated via d3.axisLeft and d3.axisBottom. The chart includes two panels, one showing the current quarter’s fact and plan figures, while mouseover and mouseout events trigger color transitions using d3.transition.