This example visualizes the monthly market capitalization of four cryptocurrencies (BTC, AAVE, XMR, LTC) as a bar chart. Users select a cryptocurrency via radio buttons, which triggers a redraw of the chart filtered to that symbol. The visualization uses D3.js v6 to parse CSV data, aggregate values by year and month with `d3.rollups`, and render logarithmic-scaled bars with `d3.scaleLog` and `d3.axisBottom`/`d3.axisLeft`. The SVG output includes rotated date labels, axis titles, and a chart title. Data comes from a remote CSV hosted as a GitHub gist.