The main feature of the south front is the great colonnade of 44 Greek Ionic columns. The columns are 45 feet high and five feet in diameter; their capitals are loosely based on those of the temple of Athena Polias at Priene and the bases on those of the temple of Dionysus at Teos. At the centre of the colonnade is an octastyle portico, two columns deep; the colonnade continues for three more columns before embracing the two wings to either side. Beyond the facade Smirke built two smaller wings, with