This visualization shows AT&T’s annual user counts from 2015 to 2021, combining a line chart and an area chart to emphasize trends. The SVG rendering uses d3.scaleLinear for both axes, d3.line and d3.area with curveBasis to generate smooth paths, and d3.axisLeft/axisBottom for tick marks. Users are plotted as raw numeric values from the CSV source, with tick labels formatted via d3.format. The area fill is colored, and axis labels are styled via CSS classes.