Before revision: For example, on larger aircraft such as Boeing 747-400, avionics bays are separated into 3 parts - main equipment center (MEC), center equipment center (CEC) and aft equipment center (AEC).
After revision: For example, on larger aircraft such as Boeing 747-400, avionics bays are dividedthethethethethe into 3 parts - main equipment center (MEC), center equipment center (CEC) and aft equipment center (AEC).