Two chart types display trends from a CSV file, with D3 v7 automatically selecting numeric columns and an appropriate x-axis (time or index). The first is a multi-series line chart with a legend, while the second combines vertical bars for one series with lines for the other two, sharing a common time or index scale. Data is fetched from a GitHub gist and parsed with a flexible delimiter detector. Both SVG charts are rendered with D3’s scales, axes, and grid lines, and include hover tooltips.