 The upper level of the arch (the attic) was composed of a series of Corinthian columns and pilasters dividing the space into three rectangular openings.Each of the outer openings was crowned with an Ionic architrave capped with dentils and a projecting geison, in the manner of the lower level.The central opening, however, was flanked by antae with engaged Corinthian half-columns that supported a projecting triangular pediment, which rested above the dentils, geison, and sima that joined to those of the two wings.