The method 15, the generation of the tracking signal is performed by operating {HEAD ~ two or more tracking cells} coupled to {TAIL ~ the first tracking bit line} 
coupled to
The method 15 , the generation of the tracking signal is performed by operating { HEAD ~ two or more tracking cells } coupled to { TAIL ~ the first tracking bit line }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL