Scholars such as Mogens Herman Hansen suggest the Pnyx was able to hold about 6,000 citizens, though later expansions may have accommodated 8,000 or as many as 13,000. French classical scholar Robert Flacelière states that the Pnyx had enough standing room for as many as 20,000 citizens, though this is disputed. The grassy area in front of the "bema" was in ancient times an area of bare rock, on which about 6,000 men could stand. This can be taken as a reasonable estimate of the number of politically active citizens (citizens were free males born in the city, or perhaps 20% of the adult population). There were wooden seats for the members of the Council of 500, who were selected by lot for terms of a single year to run the city on a day-to-day basis, and prepare the agenda for the Assembly. In later times two "stoae", or covered galleries, were built to protect the dignitaries against the rain and sun.