From where are you firing your script?
If you run the script from the tar_m02aa module, then the npcs will be spawned in that module. The script will not affect other modules. You have to attach your script in a proper location (you'll likely need 3 separate scripts).
Check the third post of this thread for some options on how to spawn a npc in a specific area:
http://www.lucasforums.com/showthread.php?t=143536)