It defines distortion as the change in gain between the quiescent point and the peak output voltage expressed as a fraction of the quiescent gain which for a grounded emitter amplifier is. In a grounded emitter amplifier the non linearity of the base emitter junction will produce about 100 distortion for about 0 2 volts across that input if you trust the standard intercept point maths. The barn roof distortion has decreased. 
				
			
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