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12The height of the tympanum, which crowns the whole work, is to be equal to one ninth part of the extent of the corona, measured from one extremity of its cymatium to the other, and set up in the centre. Its face is to stand perpendicularly over the architrave and the hypotrachelia of the columns. The coronæ over the tympanum are to be equal to that below, without the simæ. Above the coronæ are set the simæ, which the Greeks call ἐπιτιθίδες, whose height must be one-eighth more than that of the corona. The height of the acroteria is to be equal to that of the middle of the tympanum; the central ones one eighth part higher than those at the angles.
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