Pretty good.
Fonti: http://books.google.fr/books?id=UAqiVT9d0FQC&pg=PA225&lpg=PA225&dq=%22airon%C3%B2%22&source=bl&ots=MyU6WsQFti&sig=K33AFbHzIKM8PL50r_AG9wGj3yI&hl=fr&ei=FD_IS9ynNoLFsgbr_MioCw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CAgQ6AEwAQ#v=onepage&q=%22airon%C3%B2%22&f=false