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This example demonstrates a dual-line chart tracking a dataset's open and close values over time. Two separate line series, one steelblue and one red, are rendered using SVG paths within a shared time-scaled x-axis and linear y-axis. The code uses D3 version 7 with `d3.csv` to fetch remote data, `d3.scaleTime` and `d3.scaleLinear` for axes, and `d3.line` generators to map data points. Axes are added with `d3.axisBottom` and `d3.axisLeft`.