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The Old Trafford pitch is surrounded by four covered all-seater stands, officially known as the Sir Alex Ferguson (North), East, Sir Bobby Charlton (South) and West Stands. Each stand has at least two tiers, with the exception of the Sir Bobby Charlton Stand, which only has one tier due to construction restrictions. The lower tier of each stand is split into Lower and Upper sections, the Lower sections having been converted from terracing in the early 1990s.