The returned data contains aaa, radius and tacacs objects. aaa object includes auth_method and author objects. auth_method represents Authentication Order for the appliance, You can have upto 3 levels of Authentication Order (local, radius and tacacs).
author represents Authorization Information for the appliance and it consists of default user and map order.
radius and tacacs contains server object, The return value is a hash map of RADIUS/TACACS settings keyed by their Order.