▁south ▁sides ▁( with ▁each ▁of ▁the ▁four ▁corner ▁columns ▁being ▁counted ▁twice ). ▁ ▁The ▁building ▁has ▁a ▁pr ona os , ▁a ▁c ella ▁housing ▁cult ▁images ▁at ▁the ▁centre ▁of ▁the ▁structure , ▁and ▁an ▁op is th od om os . ▁The ▁alignment ▁of ▁the ▁an ta e ▁of ▁the ▁pr ona os ▁with ▁the ▁third ▁fl ank ▁columns ▁of ▁the ▁per ist yle ▁is ▁a ▁design ▁element ▁unique ▁middle ▁of ▁the ▁ 5 th   century ▁BC . ▁There ▁is ▁also ▁an ▁inner ▁Dor ic ▁colon na de ▁with ▁five ▁columns ▁on ▁the ▁north ▁and ▁south ▁side ▁and ▁three ▁across ▁the ▁end ▁( with ▁the ▁corner ▁columns ▁counting ▁twice ). ▁ ▁The ▁decor ative ▁sculpt ures ▁highlight ▁the ▁extent ▁of ▁mixture ▁of ▁the ▁two ▁styles ▁in ▁the ▁construction ▁of ▁the ▁temple . ▁Both ▁the ▁pr ona os ▁and ▁the ▁op is th od om os ▁are ▁decor ated ▁with ▁continuous ▁I onic ▁fr ie zes ▁( inst ead ▁of ▁the ▁more ▁typical ▁Dor ic ▁trig lyph s , ▁supp lement ing ▁the ▁sculpt ures ▁at ▁the ▁ped iments ▁and ▁the ▁met op es . ▁In ▁the ▁ped iments , ▁the ▁B irth ▁of ▁Ath ena ▁( east ) ▁and ▁the ▁Return ▁of ▁He pha ist os ▁to ▁O ly m pos ▁( west ), ▁and , ▁as ▁ak ro ter ia , ▁the ▁N ere ids ▁Th et is ▁and ▁Eur yn ome ▁( west ) ▁accompanied ▁by ▁Nik ai , ▁the ▁two ▁ens emb les ▁are ▁dated