The map's outermost rings represent the end of each filepath. The center of the map represents the filepaths' root.
Use this table to peruse the data pertaining that have had vulnerability fixes before. Note that a file can also have multiple fix commits for a single vulnerability.
As you can see, some files are "repeat offenders" as well, having tons of vulnerabilities in their history. Some of these may not be suprising - for example, dependency configuration files. File path names can give you an informal search of the different subsystems and features that are affected by vulnerabilities.
The Vulnerability History Project