Specifically, the elements in each spatial period of {HEAD ~ m elements} in {TAIL ~ the second line} have m mutually different responses corresponding to the dither code, where m is at least 4 and is typically 16 
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Specifically , the elements in each spatial period of { HEAD ~ m elements } in { TAIL ~ the second line } have m mutually different responses corresponding to the dither code , where m is at least 4 and is typically 16
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH