This tree visualization shows the hierarchical structure of electronic health records data, branching into categories like volume and regional groupings from South-Eastern to Western Asia. A radial icicle chart lays out the nodes from left to right, with colored paths linking parent and child nodes. The visualization uses d3.js’s `tree`, `hierarchy`, and `linkHorizontal` functions to compute the layout and draw connecting lines, while text labels with a serif font display each node’s identifier from the loaded JSON data.