This example shows three profit trends across time, one line for each customer segment, with an ordinal color scale distinguishing consumer, corporate, and home office data. A color legend at the right identifies each category. The visualization uses d3.csv to load the data, d3.nest to group records by segment, and d3.line with curveBasis to smooth the paths, while d3.scaleLinear and d3.axisBottom/axisLeft handle the axes.