This example shows a multi-line chart where three series track how their values change over roughly five weeks in spring 2012. The lines are distinguished by color and key, with each data point marked by a small circle on the SVG canvas. The x-axis uses a time scale for the dates, while the y-axis maps the numeric value. A legend identifies each line, and the chart includes axes and grid lines to aid in reading the values. The visualization demonstrates how D3.js v4 can render time-series data with multiple series using an SVG-based approach.