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Look straight up inside the tail unit's wall at the interface between the center unit and the tail unit.

The nearly-white arc is the opening between the center unit and the tail unit, allowing sunlight into the otherwise-dark tail unit; some of the connecting fittings are visible on this white ring, as is one of the four steel pads to which the engine mount was bolted (at the 4:00 position).

Visible on the forward-most former ring are the reinforcing brackets which anchor the tail unit portion of the connecting fittings.

The rectangular opening just left of bottom center, aft of a former ring, is where one of the fins joins the tail unit.