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