As a result, {TAIL ~ the initial or reference map} of {HEAD ~ media density} stored in the memory 50 is a two dimensional map, rather than the one dimensional map A of FIG 4 
As a result , { TAIL ~ the initial or reference map } of { HEAD ~ media density } stored in the memory 50 is a two dimensional map , rather than the one dimensional map A of FIG 4
OTH OTH OTH OTH TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH