rocker adjustment

Apologize for my scholastic english

 

An important question:

 

Us blank and other blank producers/shaper write, on their data sheet, "natural rocker" or, ex., +1/8"T or 1/4" T6. Easy understand first but what means exactly shape 1/4 of inch at 6 inches from tail? Does means pull out 1/4" ONLY at 6 inches from tail?  

 

TNX