Passage 5.11.4
ἐπὶ δὲ τῶν κανόνων τοῖς λοιποῖς ὁ λόχος ἐστὶν ὁ σὺν Ἡρακλεῖ μαχόμενος πρὸς Ἀμαζόνας· ἀριθμὸς μὲν δὴ συναμφοτέρων ἐς ἐννέα ἐστὶ καὶ εἴκοσι, τέτακται δὲ καὶ Θησεὺς ἐν τοῖς συμμάχοις τῷ Ἡρακλεῖ. ἀνέχουσι δὲ οὐχ οἱ πόδες μόνοι τὸν θρόνον, ἀλλὰ καὶ κίονες ἴσοι τοῖς ποσὶ μεταξὺ ἑστηκότες τῶν ποδῶν. ὑπελθεῖν δὲ οὐχ οἷόν τέ ἐστιν ὑπὸ τὸν θρόνον, ὥσπερ γε καὶ ἐν Ἀμύκλαις ἐς τὰ ἐντὸς τοῦ θρόνου παρερχόμεθα· ἐν Ὀλυμπίᾳ δὲ ἐρύματα τρόπον τοίχων πεποιημένα τὰ δὲ ἀπείργοντά ἐστι.
On the crossbars between the legs is carved the company fighting alongside Heracles against the Amazons. The total number of figures on both sides amounts indeed to twenty-nine, and Theseus too is depicted among the allies of Heracles. The throne is not supported only by the legs, but between them stand evenly spaced columns equal in length to the legs. It is not possible to pass beneath the throne, unlike the throne at Amyclae where one can pass into what lies within it; at Olympia, however, barriers resembling walls block it off.