This read-only Gauge32 reports the number of type-7, NSSA External, LSAs in this area's link-state database, per its description, which exist specifically in Not-So-Stubby Areas where external routes are advertised locally within the NSSA using type-7 rather than the domain-wide type-5 format. A nonzero count here confirms the area is actually functioning as an NSSA with locally-originated external routes, and this count should correspond to the number of externally redistributed routes an engineer expects an ASBR within that NSSA to be injecting. An engineer verifying NSSA redistribution is working as configured would check this count rather than looking for type-5 LSAs, which an NSSA by design does not flood internally.