 The "cavea" was not roofed.The spectator seats surround the stage (orchestra), which has the shape of a horseshoe, 26.64 meters long, includes 28 concentric rows of marble seats, divided into two tiers by an aisle (diazoma).The upper part of the tiers is interrupted by narrow radial stairways, which divide the cavea into wedge-shaped sectors (kerkides).