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"Original image size: 1920 x 1080 Scaled to: 2048 x 1024 (Gmod changes the background size to fit whatever screen resolution you use.) Zip contains a folder To install copy folder contents to .../garrysmod/garrysmod/ and overwrite. Don't forget to backup your current background files if you want to keep them. All credits go to Unknow author from http://stargate.wikia.com http://stargate.wikia.com/wiki/File:MyancientshipOrion_2.JPG Also a thank you to Darkangel who requested this background and linked me to the image source related: SGA Atlantis background http://www.garrysmod.org/downloads/?a=view&id=102352"