{TAIL ~ A pseudo tracking servo output signal} is generated according to the simulation parameters of {HEAD ~ the tracking servo output signal} 
{ TAIL ~ A pseudo tracking servo output signal } is generated according to the simulation parameters of { HEAD ~ the tracking servo output signal }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD