.CJ.Sometimes the factory recommended center is -1 or -2 though.
OP, Are you wondering if your skis are factory center or true center?
THalls have a true center mountaing line on them I'm prettttty sure. My 2011/2012 THalls definitely did.
Also OP, I had this exact thought when I first got my THalls true center, especially because mine were the rasta ones with the big solid colors so I could clearly see the heel piece crossed into the colors farther back, but I assure you they are true center. Also if they aren't exactly true center its not going to matter that much. I ripped a binding out of mine on a switch landing and they had to remount them like -1.5cm on one ski and -2cm back on the destroyed ski and they skied the exact same. Don't get too obsessed with the mounting point, just go ski and trust me that your skis are true center.