There are two possible interpretations for the linear structure. The first one is that it was a later reuse to act as a partition for the northern rooms of the structure in F-North. The second interpretation is that it was a curb for a pavement and all the paving stones have been robbed out. Since the feature meets with a wall (5127) of reused basalts at a right angle at its eastern limit, I favor the former interpretation.
EW thin ashlar blocks in northern part of F north