Orthostate

... the sill course. In the orthostate course of each is a single vertical Greek dowel cutting, the top edges measuring 0.489-0.52 m above the sill […]

[…] the anta block but begins with the first full orthostate (Fig. 18:a). […] The same sort of truncating of a full orthostate occurs at the reveals of the east entranceway. […] A smashed east-jamb orthostate puts this detail beyond recognition, but the west-jamb orthostate retains the whole surface with the cyma reversa intact at either end.