What was the size of the Royal Standard flying over Buckingham Palace after the wedding of Prince William and Kate Middleton?

After the wedding of Prince William and Kate Middleton on April 29, 2011, the Royal Standard was flown over Buckingham Palace. The Royal Standard is a large flag that features the royal coat of arms and is used to signify the presence of the monarch. It is larger than most flags and symbolizes the presence of the reigning monarch, which at that time was Queen Elizabeth II. The flag is flown only when the queen is in residence at the palace.