This example presents two SVG charts created with D3.js (v7). The top panel is a multi-series line chart rendering three synthetic variables (VarA, VarB, VarC) across 150 samples, with each series distinguished by color and a legend. The bottom panel combines a bar chart with a line overlay for the same random dataset, using a band scale for the x-axis and a linear scale for the y-axis. Both charts employ D3's axis, line, and scale APIs alongside standard SVG elements.