The graph of FIG 4 represents magnitude values of the output of the analog to digital converter 44 as the media 12 is transported in {TAIL ~ the longitudinal direction} from {HEAD ~ its initial starting point} 
The graph of FIG 4 represents magnitude values of the output of the analog to digital converter 44 as the media 12 is transported in { TAIL ~ the longitudinal direction } from { HEAD ~ its initial starting point }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD