Entablature being called petrification. The structure of the entablature varies with the three classical orders: Doric, Ionic, and Corinthian. In each, the proportions of the subdivisions (architrave, frieze, cornice) are defined by the proportions of the column in the order. In Roman and Renaissance interpretations, it is usually approximately a quarter of the height of the column. Variants of entablature that do not fit these models are usually derived from them. Pure classical Doric entablature is simple. The architrave, the lowest band, is split, from bottom to top, into the guttae, the regulae, and the taenia. The frieze is dominated by
Etruscan architecture section of the front, just presenting a blank platform wall elsewhere. There may only be columns at the front portico. In Etruscan temples, more than Roman ones, the portico is deep, often representing, as Vitruvius recommends, half of the area under the roof, with multiple rows of columns. At least in later temples, versions of Greek Aeolic, Ionic and Corinthian capitals are found, as well as the main Tuscan order, a simpler version of the Doric, but the attention to the full Greek detailing in the entablature that the Romans pursued seems to have been lacking. Fluted Tuscan/Doric columns can