This file is a dynamic list of the chances that the aliens will conduct a mission in a particular zone. There are 12 zones. If a priority of a zone is zero, the zone will only get terror attacks.
offset zone (EU) zone (TFTD) priority 0 North America North Atlantic 12 1 Arctic South Atlantic 04 2 Antarctic North Pacific 04 3 South America South Pacific 0a 4 Europe Mediterranean 10 5 North Africa South China Sea 0c 6 South Africa Indian Ocean 08 7 Central Asia Sea of Japan 0c 8 Southeast Asia North Sea 0f 9 Siberia Caribbean 0a 0xa Australia Antarctic 0a 0xb Pacific (+Rest) Arctic (+Rest) 05
Once all these missions (research, harvest, abduction, infiltration, and base creation) have been performed in a particular zone, the value for that zone in this file is set to zero.