The method 2, wherein {TAIL ~ the magnitude} and {HEAD ~ phase angle} of both the pseudo tracking servo output signal and the tracking servo output signal are identical 
The method 2 , wherein { TAIL ~ the magnitude } and { HEAD ~ phase angle } of both the pseudo tracking servo output signal and the tracking servo output signal are identical
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH