This example shows the distribution of applicant incomes for approved loans using a pie chart, with each slice colored according to income level and a legend mapping loan IDs to their corresponding income values. The visualization fetches CSV data from a remote GitHub gist using `d3.csv`, then computes the pie layout with `d3.pie()` and renders SVG paths via `d3.arc()`; the color scale is built with `d3.scaleOrdinal`. The legend text is formatted with `d3.format` to display values in thousands, and the SVG canvas is selected and manipulated through `d3.select`.