How can I tell what stereo my Ford Fusion has?

I bought a 2008 ford fusion sel, and i was curious if it had the upgraded "audiophile" sound system. The system sounds great, i am just wondering.How can I tell what stereo my Ford Fusion has?The models equipped with the Audiophile package will have 6"x9" in the rear deck. Non-Audiophile equipped vehicles will have 6"x8" in the front and rear doors, but no 6"x9" in the rear deck.