Hellenistic Stoa. This consisted of two rows of Doric columns and shops or lodgings at the rear for the worshippers. The columns at the front supported an architrave with metopes, triglyphs and a cornice (3rd-2nd c. BC). There was an impressive water supply system under the floor with wells (with covers, according to an inscription), subterranean tanks and terra-cotta water pipes, which replaced the earlier reservoir.